View source for Comparison of email clients

{{short description|None}}

The following tables compare general and technical features of notable non-web-based [[email client]] programs.

==General==
Basic general information about the clients: creator/company, O/S, license, and interface.

{{legend|#f4e3ff| No longer in active development}}

{{sticky header}}
{| class="wikitable sortable sticky-header"
|-
! Client
! Author/Developer
! [[#Operating system support|Operating system]]
! [[Software license]]
! User Interface
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| [[University of Washington]]
| [[Cross-platform]]
| {{open source|[[Apache License|Apache-2.0]]}}
| [[text user interface|TUI]]
|-
! {{rh}} | [[Apple Mail]]
| [[Apple Inc|Apple]]
| [[macOS]], [[iOS]], [[watchOS]]
| {{Proprietary}}
| [[graphical user interface|GUI]] ([[Cocoa (API)|Cocoa]]) 
|-
! {{rh}} | [[Balsa (email client)|Balsa]]
| Stuart Parmenter
| [[Linux]]
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| [[graphical user interface|GUI]] ([[GTK]]3)
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| Rimarts
| [[Microsoft Windows|Windows]]
| {{Proprietary}}
| [[graphical user interface|GUI]]
|-
! {{rh2}} | [[BlitzMail]]
| [[Dartmouth College]]
|
| {{open source|[[BSD licenses]]}}
| GUI
|-
! {{rh}} | [[Canary Mail]]
| Cartasec Pte. Ltd.
| Cross-platform
| {{Proprietary}}
| GUI
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| citadel.org
| [[Unix-like]]
| {{open source|[[GNU General Public License|GPL-3.0-only]]}}
| [[Webmail]]
|-
! {{rh}} | [[Claws Mail]]
| the Claws Mail team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-3.0-or-later]]}}
| [[graphical user interface|GUI]] ([[GTK]]2)
|-
! {{rh2}} | [[Courier (email client)|Courier]] <small>(formerly Calypso)</small>
| Micro Computer Systems, Inc., continued by Rose City Software
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Elm (email client)|Elm]]
| Dave Taylor, Sydney Weinstein, Bill Pemberton, Michael Elkins, Kari Hurtta
| Unix-like
| {{open source|BSD-like}}<ref>[http://www.elmme-mailer.org/NOTICE Elm Mail System GPL]</ref>
| TUI
|-
! {{rh}} | [[eM Client]]
| eM Client Inc.
| Windows, macOS, Android, iOS
| {{proprietary}}
| GUI
|-
! {{rh}} | [[EmailTray]]
| Internet Promotion Agency S.A.
| [[Windows]], [[Android (operating system)|Android]]
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Eudora OSE]]
| [[Qualcomm]]
| Windows, [[macOS]]
| {{open source}}
| GUI
|-
! {{rh}} | [[GNOME Evolution|Evolution]]
| [[The GNOME Project]]
| [[Unix-like]]
| {{open source|[[GNU Lesser General Public License|LGPL-2.1-only or LGPL-3.0-only]]}}
| GUI ([[GTK]])
|-
! {{rh}} | [[FirstClass]]
| Open Text
| 
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Forté Agent]]
| Mark Sidell
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Geary (e-mail client)|Geary]]
| [[The GNOME Project]] (formerly [[Yorba Foundation]])
| Unix-like
| {{open source|[[GNU Lesser General Public License|LGPL-2.1-or-later]]}}
| GUI ([[GTK]])
|-
! {{rh}} | [[GNUMail]]
| Ludovic Marcotte and others
| Unix-like, macOS
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| GUI
|-
! {{rh}} | [[Gnus]]
| Gnus team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-3.0-or-later]]}}
| TUI and GUI
|-
! {{rh}} | [[GroupWise]]
| [[Micro Focus]] (formerly [[Novell]])
| Cross-platform
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| Hiri
| Cross-platform
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Scribe Mail|i.Scribe, InScribe]]
| Memecode
| Windows, macOS, Linux
| {{open source|[[GNU General Public License|GPL-3.0-only]]}}
| GUI
|-
! {{rh}} | [[HCL Notes]] (formerly IBM Notes and IBM Lotus Notes)
| HCL Technologies (formerly [[IBM]] and [[Lotus Software]]), [[HCL Technologies]]
| Windows, macOS, Linux
| {{proprietary}}
| GUI (Notes), Web (Verse, iNotes) and Mobile (Traveler)
|-
! {{rh}} | [[Internet Messaging Program|IMP]]
| Horde LLC
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-only]]}}
| [[Webmail]]
|-
! {{rh}} | [[K-9 Mail]]
| K-9 Dog Walkers: cketti, et al.
| Android
| {{open source|[[Apache License|Apache-2.0]]}}
| GUI
|-
! {{rh}} | [[KMail]]
| [[KDE]]
| Cross-platform
| {{open source|[[GNU General Public License]]}}
| GUI ([[Qt (software)|Qt]])
|-
! {{rh}} | [[Mail (Windows)]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Mailbird]]
| [[Mailbird]]
| Windows
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Mailpile]]
| [[Mailpile]]
| Windows, macOS, Linux
| {{open source|[[GNU Affero General Public License|AGPL-3.0-or-later]]}}
| [[Webmail]]
|-
! {{rh}} | [[mailx]]
| {{dunno}}
| Unix-like
| {{open source|[[BSD Licenses]]}}
| TUI
|-
! {{rh2}} | [[Microsoft Entourage]]
| [[Microsoft]]
| macOS
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Microsoft Outlook]]
| Microsoft
| Windows, macOS
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| [[Mozilla Foundation]]
|
| {{open source|[[Mozilla Public License]]}}
| GUI ([[XUL]])
|-
! {{rh}} | [[Mozilla Thunderbird]]
| Mozilla Foundation
| [[Cross-platform]]
| {{open source|[[Mozilla Public License|MPL-2.0]]}}
| GUI ([[XUL]])
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| Cyrus Daboo (formerly Cyrusoft International, Inc./ISAMET)
| Cross-platform
| {{open source|[[Apache License|Apache-2.0]]}}
| GUI
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| Michael Elkins
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| [[Text-based user interface|TUI]] ([[ncurses]])
|-
! {{rh2}} | [[Netscape Messenger]]
| [[Netscape Communications]]
|
| {{dunno}}
| GUI
|-
! {{rh2}} | [[Netscape Messenger 9]]
| Netscape Communications
|
| {{open source|[[Mozilla Public License]]}}
| GUI
|-
! {{rh2}} | [[Nylas Mail]]
| Nylas
|Windows, macOS, Linux
| {{open source|[[MIT License|MIT]]}}
| GUI
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| [[RAND Corporation]]
| Unix-like
| {{open source|[[BSD Licenses]]}}
| [[Command-line interface|CLI]]
|-
! {{rh}} | Opera Mail
| [[Opera Software]]
| Cross-platform
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Outlook Express]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Pegasus Mail]]
| [[David Harris (software developer)|David Harris]]
| Windows
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| [[University of Washington]]
| Cross-platform
| {{proprietary|Freeware}}<ref>{{Cite web |url=http://www.washington.edu/pine/overview/legal.html |title=Pine License |access-date=2006-02-24 |archive-url=https://web.archive.org/web/20180602121205/http://www.washington.edu/pine/overview/legal.html |archive-date=2018-06-02 |url-status=dead }}</ref>
| TUI
|-
! {{rh2}} | [[Pocomail]]
| Poco Systems
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[RoundCube]]
| The RoundCube Team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-3.0-or-later]]}}
| [[Webmail]]
|-
!{{rh}} | [[Samsung Email]]
|[[Samsung Electronics]]
|Samsung, Android 8+
| {{proprietary}}
|GUI
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| SeaMonkey Council
| Cross-platform
| {{open source|[[Mozilla Public License|MPL-2.0]]}}
| GUI ([[XUL]])
|-
! {{rh}} | [[Spark (application)|Spark]]
| Readdle
| macOS
| {{proprietary}}
| GUI
|-
! {{rh}} | [[SquirrelMail]]
| The SquirrelMail Project Team
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| [[Webmail]]
|-
! {{rh}} | [[Superhuman (email client)|Superhuman]]
| Rahul Vohra
| Cross-platform
| {{proprietary}}
| [[Webmail]]
|-
! {{rh2}} | [[Sylpheed]]
| Hiroyuki Yamamoto
| [[Cross-platform]]
| {{open source|Sylpheed: [[GNU General Public License|GPL-2.0-or-later]]<br />LibSylph: [[GNU Lesser General Public License|LGPL-2.1-or-later]]}}
| GUI ([[GTK]]2)
|-
! {{rh}} | [[The Bat!]]
| RitLabs
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Trojitá]]
| [[KDE]]
| Cross-platform
| {{open source|[[GNU General Public License|GPL-2.0-only]] or [[GNU General Public License|GPL-3.0-only]]}}{{r|group=Note|LicenseRef-KDE-Accepted-GPL}}
| GUI ([[Qt (software)|Qt]])
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| [[Demon Internet|Thus PLC (Demon Internet)]]
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[Vivaldi_(web_browser)|Vivaldi]]
| [[Vivaldi_Technologies|Vivaldi Technologies AS]]
| Cross-platform
| {{proprietary}}
| GUI (Chrome)
|-
! {{rh2}} | [[Windows Live Mail]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh2}} | [[Windows Mail (Vista)]]
| Microsoft
| Windows
| {{proprietary}}
| GUI
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| YAM Open Source Team and contributing authors
| [[AmigaOS]]
| {{open source|[[GNU General Public License|GPL-2.0-or-later]]}}
| GUI
|-
! {{rh}} | [[Zimbra|Zimbra Desktop]]
| [[Zimbra]]
| Cross-platform
| {{open source|[[Mozilla Public License]] for server and [[Zope Public License|ZPL]] for client}}
| GUI
|-class="sortbottom"
! Client
! Author/Developer
! Operating system
! Software license
! User interface
|}

{{reflist|group=Note|refs=
<ref name="LicenseRef-KDE-Accepted-GPL">Or LicenseRef-KDE-Accepted-GPL: "''Any later version accepted by the membership of KDE e.V. (or its successor approved by the membership of KDE e.V.), which shall act as a proxy defined in Section 14 of version 3 of the license.''"</ref>
}}

==Release history==
A brief digest of the release histories.

{| class="wikitable sortable sticky-header"
|-
!  Client
!  First public Date
!  First public Version
!  First stable Date
!  First stable Version
!  data-sort-type="text" | Latest stable release
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| 2006-11
| 0.8
| 2007 December 
| 1.00
| {{wikidata|property|preferred|references|edit|Q1819542|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1819542|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Apple Mail]]
| 2001-03-24
| ?
| ?
| ?
| {{wikidata|property|Q212211|P348}} ({{start date and age|{{wikidata|qualifier|Q212211|P348|P577}}}})
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| 1996
| 1
| {{dunno}}
| {{dunno}}
| {{wikidata|property|preferred|references|edit|Q837949|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q837949|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Canary Mail]]
| 2017-06-15
| 1.0
| 2017-06-15
| 1.0
| 4.01 (5th  June, 2023)
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| 1987
| {{dunno}}
| 1988
| 1.00
| {{wikidata|property|preferred|references|edit|Q1093291|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1093291|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Claws Mail]]
| 2001-05
| 0.4.67
| 2005-01
| 1.0.0
| {{wikidata|property|preferred|references|edit|Q1099163|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1099163|P348|P548=Q2804309|P577}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| 2004-06
| 3.5
| discontinued
| discontinued
| {{Latest stable software release/Courier}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| 1986
| {{dunno}}
| 1987-03
| 2
| {{wikidata|property|preferred|references|edit|Q1332651|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1332651|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[eM Client]]
| 2007-11
| 1.0
| 2007-11
| 1.0
| {{Latest stable software release/eM Client}}
|-
! {{rh}} | [[EmailTray]]
| 2010-10
| 2.0
| 2011-03
| 3.11
| {{Latest stable software release/EmailTray}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| 1988<ref name="eudorabirth">{{cite web |url=http://www.eudora.com/presskit/backgrounder.html |title=The Birth of Eudora |accessdate=2007-04-10 |archive-url=https://web.archive.org/web/20021108211012/http://www.eudora.com/presskit/backgrounder.html |archive-date=2002-11-08 |url-status=dead }}</ref>
| {{dunno}}
| 1988<ref name="eudorabirth" />
| {{dunno}}
| {{Latest stable software release/Eudora}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| 2000-05-11
| 0.0
| 2001-12-03
| 1.0
| {{wikidata|property|preferred|references|edit|Q336251|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q336251|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Forté Agent]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Latest stable software release/Forté Agent}}
|-
! {{rh}} | [[Geary (software)|Geary]]
| 2012
| 0.1
| 2012
| 0.1
| {{wikidata|property|preferred|references|edit|Q20715678|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q20715678|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Gnus]]
| 1987<ref name="gnusrelease">{{cite web|url=http://gnus.org/2.0/gnus.1|title=GNUS: a NNTP based news reader for GNU Emacs (1 of 2)|accessdate=2008-08-04|url-status=dead|archiveurl=https://web.archive.org/web/20160303190300/http://gnus.org/2.0/gnus.1|archivedate=2016-03-03}}</ref>
| {{dunno}}
| 1988-02-01<ref name="gnusrelease"/>
| 2.0
| 2015-04-06 {{Latest stable software release/Gnus}}
|-
! {{rh}} | [[GroupWise]]
| {{dunno}}
| {{dunno}}
| 1986
| 1.0
| {{wikidata|property|preferred|references|edit|Q128926|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q128926|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| 2014-02
| 0.4
| 2016-06
| 1.0
| {{Latest stable software release/Hiri}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| 1999
| 1.00
| {{dunno}}
| {{dunno}}
| {{Latest stable software release/Scribe Mail}}
|-
! {{rh}} | [[HCL Notes]] (formerly IBM Lotus Notes)
| [[Lotus Notes#Version history|1989]]
| [[Lotus Notes#Version history|1.0]]
| [[Lotus Notes#Version history|1989]]
| [[Lotus Notes#Version history|1.0]]
| {{wikidata|property|preferred|references|edit|Q60198|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q60198|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Internet Messaging Program|IMP]]
| {{dunno}}
| {{dunno}}
| 1998
| 1.0
| {{wikidata|property|preferred|references|edit|Q477979|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q477979|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[K-9 Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{wikidata|property|preferred|references|edit|Q14565723|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q14565723|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[KMail]]
| 1998-10
| Alpha
| 1999-02
| 1.0.17
| {{wikidata|property|preferred|references|edit|Q260852|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q260852|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Mailbird]]
| 2013-04-01
| Public Beta
| {{dunno}}
| {{dunno}}
| {{Latest stable software release/Mailbird}} 
|-
! {{rh}} | [[Mailpile]]
| 2011-11
| <ref>[https://github.com/mailpile/Mailpile/wiki/Release-Notes-201401-Alpha Alpha]</ref>
| <ref>[https://www.mailpile.is/blog/2017-01-30_A_Plan_for_2017.html tbd 2017]</ref>
| <ref>[https://www.mailpile.is/blog/2017-08-13_SHA2017.html 1.00 RC]</ref>
| {{Latest stable software release/Mailpile}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Latest stable software release/Microsoft Entourage}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| 1997
| 97
| 1997
| 97
| {{Latest stable software release/Microsoft Office}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| 2003-07-28
| 0.1
| 2004-12-07
| 1.0
| {{wikidata|property|preferred|references|edit|Q483604|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q483604|P348|P548=Q2804309|P577}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| 1996-09-20
| 1.0
| 1996-09-20
| 1.0
| {{Latest stable software release/Mulberry}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| 1995
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{wikidata|property|preferred|references|edit|Q1457398|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1457398|P348|P548=Q2804309|P577}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Latest stable software release/Netscape Mail & Newsgroups}} 
|-
! {{rh2}} | [[Netscape Messenger 9]]
| 2007-11-15
| 9.0a1
| discontinued
| discontinued
| 2007-11-15
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| 1979
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Latest stable software release/MH Message Handling System}}
|-
! {{rh}} | Opera Mail
| 1996-09
| 2.1b1
| 1996-12
| 2.1
| {{Latest stable software release/Opera Mail}}
|-
! {{rh2}} | [[Outlook Express]]
| 1996
| 3.0
| {{dunno}}
| {{dunno}}
| {{wikidata|property|preferred|references|edit|Q850109|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q850109|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Pegasus Mail]]
| 1990
| {{dunno}}
| 1990
| {{dunno}}
| {{wikidata|property|preferred|references|edit|Q1639942|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1639942|P348|P548=Q2804309|P577}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| 1992-01-15
| 2.00
| 1992-01-15
| 2.00
| {{wikidata|property|preferred|references|edit|Q598868|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q598868|P348|P548=Q2804309|P577}}
|-
! {{rh2}} | [[Pocomail]]
| 1999
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Latest stable software release/Pocomail}}
|-
! {{rh}} | [[RoundCube]]
| 2006
| 0.1-rc1
| 2014-04-07
| 1.0.0
| {{wikidata|property|preferred|references|edit|Q1769269|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1769269|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| 2005-09-15
| 1.0a
| 2006-01-30
| 1.0
| {{wikidata|property|preferred|references|edit|Q156197|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q156197|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[SquirrelMail]]
| 1999-12
| 0.1
| 2001-01
| 1.0
| {{wikidata|property|preferred|references|edit|Q1752969|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1752969|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Sylpheed]]
| 2000-01
| 0.1.0
| 2004-12
| 1.0.0
| {{wikidata|property|preferred|references|edit|Q2141006|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q2141006|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[The Bat!]]
| 1997-03
| 1.0 Beta
| 1998-03
| 1.00 Build 1310
| {{wikidata|property|preferred|references|edit|Q1634279|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q1634279|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Trojitá]]
| 2009-08
| 0.1
| 2012-12
| 0.3.90
| {{wikidata|property|preferred|references|edit|Q7845142|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q7845142|P348|P548=Q2804309|P577}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| 1996 (circa)
| 1.0
| 1996 (circa)
| 1.0
| {{Latest stable software release/Turnpike}}
|-
! {{rh}} | [[Vivaldi_(web_browser)|Vivaldi]]
| 2015-11-03
| Beta 1
| 2022-06-09
| 1.0
|
|-
! {{rh2}} | [[Windows Live Mail]]
| 2007-11-06
| 12
| 2007-11-06
| 12
| {{Latest stable software release/Windows Live Mail}}
|-
! {{rh2}} | [[Windows Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| 2007-01-01
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| 1995
| 1.0
| 1995
| 1.0
| {{wikidata|property|preferred|references|edit|Q2600208|P348|P548=Q2804309}} {{wikidata|qualifier|preferred|single|Q2600208|P348|P548=Q2804309|P577}}
|-
! {{rh}} | [[Zimbra]]
| 2005-11
| Beta
| 2006-03
| 3.5
| {{Latest stable software release/Zimbra}}
|-
|}

==Operating system support==
The [[operating system]]s on which the clients can run natively (without emulation).

{| class="wikitable sortable sticky-header"
|-
! Client
! [[Microsoft Windows]]
! [[macOS]]
! [[Linux]]
! [[BSD]]
! [[Unix]]
! [[DOS]]
! Other
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Apple Mail]]
| {{no}}
| {{included}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Balsa (email client)|Balsa]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Canary Mail]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Claws Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[eM Client]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[EmailTray]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{no}} {{r|group=Note|Evolution_nowin}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Forté Agent]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Geary (software)|Geary]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Gnus]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[GroupWise]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[IBM Lotus Notes]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Internet Messaging Program|IMP]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[KMail]]
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Mailbird]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Mailpile]]
| {{yes}} {{r|group=Note|Mailpile_soon}}
| {{yes}} {{r|group=Note|Mailpile_soon}}
| {{yes}}
| {{yes}} {{r|group=Note|Mailpile_foss}}
| {{yes}} {{r|group=Note|Mailpile_foss}}
| {{no}}  {{r|group=Note|Mailpile_port}}
| {{no}}  {{r|group=Note|Mailpile_port}}
|-
! {{rh}} | [[mailx]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{no}}
| {{terminated}} (2008)
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| colspan="5" {{terminated}} (1.7.13)
| {{no}}
| {{no}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}<ref>{{cite web|url=http://www.caddit.net/programming.php|title=Other Programming Projects and Downloads|accessdate=2007-04-06|archive-url=https://web.archive.org/web/20070404233358/http://caddit.net/programming.php|archive-date=2007-04-04|url-status=dead}}</ref>
| {{no}}
|-
! {{rh2}} | [[Netscape Messenger]]
| colspan="5" {{terminated}} (4.80)
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| colspan="5" {{terminated}} (9.0a1)
| {{no}}
| {{no}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | Opera Mail
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Outlook Express]]
| {{included}} (up to XP)
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes|[[NetWare]]<br />[[NetWare Loadable Module|NLM]]}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{terminated}} (3.96)<ref>{{Cite FTP |url=ftp://ftp.cac.washington.edu/pine/pcpine/old/PC-PINE-3.96/README|server=FTP server|url-status=dead|title=PC-PINE-3.96 README|accessdate=2007-04-06}}</ref>
| {{no}}
|-
! {{rh2}} | [[Pocomail]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[RoundCube]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[SquirrelMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Sylpheed]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[The Bat!]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Trojitá]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes|[[MeeGo]]}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Vivaldi_(web_browser)|Vivaldi]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Windows Mail]]
| {{included}} (Vista)
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{Yes|[[AmigaOS]]<br />[[AROS Research Operating System|AROS]]<br />[[MorphOS]]}}
|-
! {{rh}} | [[Zimbra]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-class="sortbottom"
! Client
! [[Microsoft Windows]]
! [[macOS]]
! [[Linux]]
! [[BSD]]
! [[Unix]]
! [[DOS]]
! Other
|}
{{reflist|group=Note|refs=
<ref name=Evolution_nowin>Development [[Evolution (software)#Defunct macOS and Windows ports|stopped in 2008]]</ref>
<ref name=Mailpile_soon>Packaging planned</ref>
<ref name=Mailpile_foss>[[Free Software]] project, source available.</ref>
<ref name=Mailpile_port>[[Free Software]] porting tangible provided OS has web browser.</ref>
}}


==Protocol support==

===Communication and access protocol support===

What email and related protocols and standards are supported by each client.
{{sort-under}}
{| class="wikitable sortable sort-under sticky-header"
! style="width:12em" | Client
! [[Post Office Protocol|POP3]] <br /> fetch all messages <br />([https://www.ietf.org/rfc/rfc1939.txt RFC 1939])
! [[Post Office Protocol|POP3]] <br /> selected by filter <br/ >([https://www.ietf.org/rfc/rfc1939.txt RFC 1939])
! [[Post Office Protocol|POP3]] <br /> selected by user <br />([https://www.ietf.org/rfc/rfc1939.txt RFC 1939])
! [[Internet Message Access Protocol|IMAP4]]<br />([https://www.ietf.org/rfc/rfc3501.txt RFC 3501])
! [[Simple Mail Transfer Protocol|SMTP]]<br />([https://www.ietf.org/rfc/rfc5321.txt RFC 5321])
! [[Network News Transfer Protocol|NNTP]]<br />([https://www.ietf.org/rfc/rfc3977.txt RFC 3977])
! [[Lightweight Directory Access Protocol|LDAP]]&nbsp;v2<br />([https://www.ietf.org/rfc/rfc4511.txt RFC 4511])
! [[Lightweight Directory Access Protocol|LDAP]]&nbsp;v3<br />([https://www.ietf.org/rfc/rfc4511.txt RFC 4511])
! [[Microsoft Exchange Server|EWS]]
! [[IPv6]]<br />([https://www.ietf.org/rfc/rfc2460.txt RFC 2460])
! [[MAPI]]
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Apple Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|BECKY_frnews}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Canary Mail]] 
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[eM Client]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[EmailTray]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes2|plug-in}}
| {{dunno}}
| {{yes2|plug-in}}
|-
! {{rh}} | [[Gnus]]
| {{yes}}
| {{yes}}
| {{yes}}<ref>(setq gnus-select-method '(pop3 "pop.example.com")) <br / >(setq gnus-secondary-select-methods '((nntp "news.gnus.org"))) <br /> After configuring Gnus for POP3, you can use the gnus-group-get-new-news command to retrieve new messages from your POP3 server. </ref>
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} <!---{{r|group=Note|GnusLDAP}} named ref does not exist--->
| {{yes}} <!---{{r|group=Note|GnusLDAP}} named ref does not exist--->
| {{no}}
| {{yes}}
| {{yes2|Plug-in}}<ref>{{cite web |title=w32-send-mapi.el |url=https://www.emacswiki.org/emacs/w32-send-mapi.el}}</ref>
|-
! {{rh}} | [[GroupWise]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}} 
| {{yes}} 
| {{yes}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}} {{r|group=Note|plugin}}
| {{yes}} {{r|group=Note|plugin}}
| {{no}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[HCL Notes]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[KMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}} {{r|group=Note|KDENNTP}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mailbird]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Mailpile]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{partial}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage| Microsoft Entourage 2008, Web Services Edition]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{partial}}
| {{partial}}<ref>Write to LDAP still missing after 10 years, [https://bugzilla.mozilla.org/show_bug.cgi?id=86405 Mozilla bug 86405]</ref>
| extensible<ref>Add-ons include MesQuilla [http://mesquilla.com/extensions/exquilla/ ExQuilla Exchange Web Services (alpha)] (see also [https://addons.mozilla.org/en-US/thunderbird/addon/exquilla-exchange-web-services/ ''ExQuilla'' for Microsoft Exchange]) and 
[https://addons.mozilla.org/en-US/thunderbird/addon/provider-for-microsoft-exchang/ ''Provider'' for Microsoft Exchange]
</ref>
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{yes}}
| style="background: #ffffdd;" | No (possible with POP3 browser)
| style="background: #ffffdd;" | No (possible with POP3 browser)
| {{yes}}
| {{yes}}
| {{no}} ([[slrn]] looks alike)
| {{partial}} (resolve real names through NSS)
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{dunno}}
| {{no}}
|-
! {{rh}} | Opera Mail
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Outlook Express]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{dunno}}
| {{no}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|pegasusaddins}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pocomail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[RoundCube]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{partial}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[SquirrelMail]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[The Bat!]]
| {{yes}}
| {{yes}} {{r|group=Note|SelectiveDownload}}
| {{yes}} {{r|group=Note|MessageDispatcher}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|BAT_mygate}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Trojitá]]
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Vivaldi_(web_browser)|Vivaldi]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{no}}
|-
! {{rh2}} | [[Windows Mail]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Zimbra]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
|-class="sortbottom"
! Client
! [[Post Office Protocol|POP3]] <br /> fetch all messages <br />([https://www.ietf.org/rfc/rfc1939.txt RFC 1939])
! [[Post Office Protocol|POP3]] <br /> selected by filter <br/ >([https://www.ietf.org/rfc/rfc1939.txt RFC 1939])
! [[Post Office Protocol|POP3]] <br /> selected by user <br />([https://www.ietf.org/rfc/rfc1939.txt RFC 1939])
! [[Internet Message Access Protocol|IMAP4]]<br />([https://www.ietf.org/rfc/rfc3501.txt RFC 3501])
! [[Simple Mail Transfer Protocol|SMTP]]<br />([https://www.ietf.org/rfc/rfc5321.txt RFC 5321])
! [[Network News Transfer Protocol|NNTP]]<br />([https://www.ietf.org/rfc/rfc3977.txt RFC 3977])
! [[Lightweight Directory Access Protocol|LDAP]]&nbsp;v2<br />([https://www.ietf.org/rfc/rfc4511.txt RFC 4511])
! [[Lightweight Directory Access Protocol|LDAP]]&nbsp;v3<br />([https://www.ietf.org/rfc/rfc4511.txt RFC 4511])
! [[Microsoft Exchange Server|EWS]]
! [[IPv6]]<br />([https://www.ietf.org/rfc/rfc2460.txt RFC 2460])
! [[MAPI]]
|}

===Integration protocol support===

{| class="wikitable sortable sort-under sticky-header"
! style="width:12em" | Client
! [[IMSP]]<br />([https://datatracker.ietf.org/doc/id/draft-myers-imap-imsp-00.txt])
! [[Application Configuration Access Protocol|ACAP]]<br />([https://www.ietf.org/rfc/rfc2244.txt RFC 2244])
! [[RSS (file format)|RSS 0.91]] [[Web feed|Feeds]]
! [[RSS (file format)|RSS 1.0]] [[Web feed|Feeds]]
! [[RSS (file format)|RSS 2.0]] [[Web feed|Feeds]]
! [[Atom (standard)|ATOM]] [[Web feed|Feeds]]
! [[iCalendar]]<br />([https://www.ietf.org/rfc/rfc5545.txt RFC 5545])
! [[Messaging Application Programming Interface|MAPI/RPC]]
! [[CalDAV]]<br />([https://www.ietf.org/rfc/rfc4791.txt RFC 4791])
! [[CardDAV]]<br />([https://www.ietf.org/rfc/rfc6352.txt RFC 6352])
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Apple Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{dunno}}
| {{dunno}}
| {{yes}} {{r|group=Note|BECKY_rss}}
| {{yes}} {{r|group=Note|BECKY_rss}}
| {{yes}} {{r|group=Note|BECKY_rss}}
| {{yes}} {{r|group=Note|BECKY_rss}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Canary Mail]] 
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| {{dunno}}
| {{dunno}}
| {{no}}
| {{yes}} {{r|group=Note|Claws}}
| {{yes}} {{r|group=Note|Claws}}
| {{yes}} {{r|group=Note|Claws}}
| {{yes}} {{r|group=Note|Claws2}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[eM Client]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[EmailTray]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{no}}
| {{no}}
| {{no}} {{r|group=Note|Evolution-rss}}
| {{no}} {{r|group=Note|Evolution-rss}}
| {{no}} {{r|group=Note|Evolution-rss}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Gnus]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}<ref>{{cite web |title=GNU emacs - rss |url=https://www.emacswiki.org/emacs/Rss}}</ref>
| {{yes}}<ref>via org-mode</ref>
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[GroupWise]]
| {{dunno}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[IBM Lotus Notes]]
| {{no}}
| {{no}}
| {{yes}} {{r|group=Note|NotesRSS}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[KMail]]
| {{dunno}}
| {{dunno}}
| {{yes}} {{r|group=Note|KDEFeeds}}
| {{yes}} {{r|group=Note|KDEFeeds}}
| {{yes}} {{r|group=Note|KDEFeeds}}
| {{yes}} {{r|group=Note|KDEFeeds}}
| {{yes}} {{r|group=Note|KDEiCal}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Mailpile]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| {{dunno}}
| {{dunno}}
| {{yes}} {{r|group=Note|OutlookFeeds}}
| {{yes}} {{r|group=Note|OutlookFeeds}}
| {{yes}} {{r|group=Note|OutlookFeeds}}
| {{yes}} {{r|group=Note|OutlookFeeds}}
| {{partial|Yes}} {{r|group=Note|OutlookiCal}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|MTB}}
| {{yes}} {{r|group=Note|SimpleMAPI}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | Opera Mail
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Outlook Express]]
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{dunno}}
| {{dunno}}
| {{yes}} {{r|group=Note|pegasusaddins}}
| {{yes}} {{r|group=Note|pegasusaddins}}
| {{yes}} {{r|group=Note|pegasusaddins}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pocomail]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|MTB}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SquirrelMail]]
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[The Bat!]]
| {{no}}
| {{no}}
| {{yes}} {{r|group=Note|BAT_rss2pop3}}
| {{yes}} {{r|group=Note|BAT_rss2pop3}}
| {{yes}} {{r|group=Note|BAT_rss2pop3}}
| {{yes}} {{r|group=Note|BAT_rss2pop3}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
|-
! {{rh}} | [[Trojitá]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Zimbra]]
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-class="sortbottom"
! Client
! [[IMSP]]<br />([https://datatracker.ietf.org/doc/id/draft-myers-imap-imsp-00.txt])
! [[Application Configuration Access Protocol|ACAP]]<br />([https://www.ietf.org/rfc/rfc2244.txt RFC 2244])
! [[RSS (file format)|RSS 0.91]] [[Web feed|Feeds]]
! [[RSS (file format)|RSS 1.0]] [[Web feed|Feeds]]
! [[RSS (file format)|RSS 2.0]] [[Web feed|Feeds]]
! [[Atom (standard)|ATOM]] [[Web feed|Feeds]]
! [[iCalendar]]<br />([https://www.ietf.org/rfc/rfc5545.txt RFC 5545])
! [[Messaging Application Programming Interface|MAPI/RPC]]
! [[CalDAV]]<br />([https://www.ietf.org/rfc/rfc4791.txt RFC 4791])
! [[CardDAV]]<br />([https://www.ietf.org/rfc/rfc6352.txt RFC 6352])
|}

{{reflist|group=Note|refs=
<ref name=BECKY_rss>Becky! requires BkBlogReader or BkRSSviewer or B.F.R or BkRssReader plugin installed for handling RSS and ATOM.</ref>
<ref name=BECKY_frnews>Becky! requires FRNews or BkNews plugin installed for handling NNTP.</ref>
<!--
<ref name=EmacsLDAP> An Emacs module named EUDC extends [[Gnus]]/[[VM (View Mail)]] and [[BBDB]] to support LDAP.</ref>
-->
<ref name=KDENNTP>KDE supports Newsgroups (NNTP) by the use of [[KNode]]</ref>
<ref name=KDEFeeds>KDE supports feeds by the use of [[Akregator]]</ref>
<ref name=KDEiCal>KDE supports iCal by the use of [[KOrganizer]]</ref>
<ref name=NotesRSS>Studio Blog Reader is one RSS reader application for [[IBM Lotus Notes]]. [[IBM Lotus Notes]] version 8.x introduced a native RSS reader.</ref>
<ref name=OutlookFeeds>Support of feeds is available in [[Microsoft Office 2007#Microsoft Office Outlook|Microsoft Office Outlook 2007]]. Earlier versions require [http://www.paradisoft.com/rsspopper/rsspopper.asp RSSPopper] plug-in.</ref>
<ref name=OutlookiCal>[[ICalendar#Microsoft Outlook|Microsoft Outlook support of iCalendar]] varies by version.</ref>
<ref name=SelectiveDownload>''Selective Download filters'' can skip/delete messages on POP3 server based on header (sender, recipient, subject, etc) information, this doesn't require to retrieve the full message body from the server.</ref>
<ref name=MessageDispatcher>''Message Dispatcher'' allows the user to decide which messages should be retrieved, deleted or skipped based on the header information (sender, recipient, subject, etc) displayed to the user.</ref>
<ref name=MTB>iCalendar is supported with an extension.</ref>
<ref name=Claws>RSSyl plugin is required to read RSS and ATOM in Claws Mail.</ref>
<ref name=Claws2>vCalendar plugin is required to handle iCalendar in Claws Mail.</ref>
<ref name=BAT_mygate>The Bat! requires MyGate plugin installed for handling NNTP.</ref>
<ref name=BAT_rss2pop3>The Bat! versions prior to 6.3 required rss2mail or rss2pop3 plugin installed for handling RSS and ATOM. The Bat! versions 6.3 and later have built-in support for RSS.</ref>
<ref name=plugin>i.Scribe / InScribe requires a plugin to handle LDAP.</ref>
<ref name=pegasusaddins>Pegasus Mail can convert Newsgroup messages and/or RSS feeds to emails through the use of free add-ons.</ref>
<!-- <ref name=MailiCal>With Mail version 4, in macOS 10.6 Snow Leopard. In previous versions, Mail only links it with iCal.</ref> -->
<ref name="Evolution-rss">The evolution-rss plugin (provided as a separate package by many distributions provides the RSS functionality in Evolution.</ref>
<ref name=SimpleMAPI>Mozilla Thunderbird only supports SimpleMAPI.{{citation needed|date=May 2011}}</ref>
}}

===Authentication support===
{{sort-under}}
{| class="wikitable sortable sort-under sticky-header-multi"
|-
! rowspan="2" |Client
! colspan="2" | Regular
! rowspan="2" {{verth|va=middle|MSN ([[NTLM]])<br/>browser login}}
! rowspan="2" {{verth|va=middle|Compuserve<br/>(RPA)}}
! rowspan="2" {{verth|va=middle|MD5 APOP&nbsp;{{r|group=Note|APOP}}}}
! colspan="3" | CRAM-HMAC<br/>{{r|group=Note|HMAC}}
! rowspan="2" {{verth|va=middle|DIGEST-MD5}}
! rowspan="2" {{verth|va=middle|SCRAM}}
! rowspan="2" {{verth|va=middle|with hardware token<br/>[[PKCS11|PKCS#11]]}}
! rowspan="2" {{verth|va=middle|Biometric}}
! rowspan="2" {{verth|va=middle|SMTP Auth&nbsp;{{r|group=Note|SMTPAUTH}}}}
! rowspan="2" {{verth|va=middle|[[X.509]]<br/>[[Client certificate]]}}
! rowspan="2" {{verth|va=middle|[[OAuth]]}}
|-
! {{verth|va=middle|LOGIN}}
! {{verth|va=middle|PLAIN}}
! {{verth|va=middle|MD5}}
! {{verth|va=middle|SHA1}}
! {{verth|va=middle|RIPEMD}}
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | [[Apple Mail]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|AppleMailOAuth}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Canary Mail]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}  
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}} 
| {{yes}}
| {{no}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{yes}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[eM Client]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[EmailTray]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[Gnus]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[GroupWise]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[IBM Lotus Notes]]
| {{yes}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[KMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Mailpile]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}<ref name="bugzilla.mozilla.org">{{Cite web|url=https://bugzilla.mozilla.org/show_bug.cgi?id=335924|title = 335924 - No authentication with DIGEST-MD5}}</ref>
| {{dunno}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no|1.5.15}}
| {{yes}}
| {{no|1.10.1}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | Opera Mail
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh2}} | [[Outlook Express]]
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
|-
! {{rh2}} | [[Pocomail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[RoundCube]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}<ref name="bugzilla.mozilla.org"/>
| {{dunno}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[SquirrelMail]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[The Bat!]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{yes}} {{r|group=Note|TheBat}}
| {{yes}} {{r|group=Note|TheBat}}
| {{yes}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[Trojitá]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Windows Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}} {{r|group=Note|WindowsMailOAuth}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes|AmiSSL}}
| {{dunno}}
|-
! {{rh}} | [[Zimbra]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}} {{r|group=Note|Zimbra}}
| {{dunno}}
| {{dunno}}
|-class="sortbottom"
! rowspan="2" |Client
! colspan="2" | Regular
! rowspan="2" {{verth|va=middle|MSN ([[NTLM]])<br/>browser login}}
! rowspan="2" {{verth|va=middle|Compuserve<br/>(RPA)}}
! rowspan="2" {{verth|va=middle|MD5 APOP&nbsp;{{r|group=Note|APOP}}}}
! colspan="3" | CRAM-HMAC<br/>{{r|group=Note|HMAC}}
! rowspan="2" {{verth|va=middle|DIGEST-MD5}}
! rowspan="2" {{verth|va=middle|SCRAM}}
! rowspan="2" {{verth|va=middle|with hardware token<br/>[[PKCS11|PKCS#11]]}}
! rowspan="2" {{verth|va=middle|Biometric}}
! rowspan="2" {{verth|va=middle|SMTP Auth&nbsp;{{r|group=Note|SMTPAUTH}}}}
! rowspan="2" {{verth|va=middle|SSL/TLS<br/>Client Certificate}}
! rowspan="2" {{verth|va=middle|OAUTH}}
|-class="sortbottom"
! {{verth|va=middle|LOGIN}}
! {{verth|va=middle|PLAIN}}
! {{verth|va=middle|MD5}}
! {{verth|va=middle|SHA1}}
! {{verth|va=middle|RIPEMD}}
|}
{{reflist|group=Note|refs=
<ref name=AppleMailOAuth>Minimum Mac OS version 10.11. Minimum iOS version 11.</ref>
<ref name=APOP>Description: {{IETF RFC|1734}}</ref>
<ref name=HMAC>Description: {{IETF RFC|2195}}</ref>
<!-- <ref name=MailCRAM>[http://docs.info.apple.com/article.html?artnum=120103 10.1.3 Apple adds SSL and CRAM-MD5 support to Mail]</ref>
<ref name=MailNTML>[http://www.apple.com/macosx/features/mail/ Apple supports NTLM v2 in Mail as of 10.4 release]</ref> -->
<ref name=SMTPAUTH>Description: {{IETF RFC|2554}}</ref>
<ref name=TheBat>Professional Edition.</ref>
<ref name=WindowsMailOAuth>Windows 10 required.</ref>
<ref name=Zimbra>[http://www.zimbra.com/desktop7/help/en_US/Zimbra_Mail_Help.htm#Getting_Started/Zimbra_User_Help.htm Zimbra Desktop supports SMTP auth, not sure about collaboration suite]</ref>
}}

===SSL and TLS support===

{| class="wikitable sortable sort-under sticky-header-multi"
|-
! rowspan="2" | Client
! colspan="2" | Secure POP3
! colspan="2" | Secure IMAP4
! colspan="2" | Secure SMTP
! colspan="2" | Secure NNTP
! colspan="2" | Secure LDAP
! rowspan="2" | SNI
! rowspan="2" | OCSP&nbsp;{{r|group=Note|OCSP}}
! rowspan="2" | CRL&nbsp;{{r|group=Note|CRL}}
|-
! SSL
! TLS&nbsp;{{r|group=Note|IMAPPOP}}
! SSL
! TLS&nbsp;{{r|group=Note|IMAPPOP}}
! SSL
! TLS&nbsp;{{r|group=Note|SMTPTLS}}
! SSL
! TLS
! SSL
! TLS
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Apple Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Canary Mail]]
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[eM Client]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[EmailTray]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Gnus]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[GroupWise]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[IBM Lotus Notes]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[KMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mailpile]]
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no|1.5.15}}
| {{no|1.5.15}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | Opera Mail
| {{yes}}
| {{partial}} {{r|group=Note|M2STLS}}
| {{yes}}
| {{partial}} {{r|group=Note|M2STLS}}
| {{yes}}
| {{partial}} {{r|group=Note|M2STLS}}
| {{yes}}
| {{no}}
| {{n/a}}
| {{n/a}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Outlook Express]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pocomail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[RoundCube]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[SquirrelMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[The Bat!]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}} {{r|group=Note|TBCSP}}
| {{yes}} {{r|group=Note|TBCSP}}
|-
! {{rh}} | [[Trojitá]]
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}} (system)
| {{yes}} (system)
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Mail]]
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Zimbra]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-class="sortbottom"
! rowspan="2" | Client
! colspan="2" | Secure POP3
! colspan="2" | Secure IMAP4
! colspan="2" | Secure SMTP
! colspan="2" | Secure NNTP
! colspan="2" | Secure LDAP
! rowspan="2" | SNI
! rowspan="2" | OCSP&nbsp;{{r|group=Note|OCSP}}
! rowspan="2" | CRL&nbsp;{{r|group=Note|CRL}}
|-class="sortbottom"
! SSL
! TLS&nbsp;{{r|group=Note|IMAPPOP}}
! SSL
! TLS&nbsp;{{r|group=Note|IMAPPOP}}
! SSL
! TLS&nbsp;{{r|group=Note|SMTPTLS}}
! SSL
! TLS
! SSL
! TLS
|}
{{reflist|group=Note|refs=
<ref name=SMTPTLS>Description: {{IETF RFC|2487}}</ref>
<ref name=IMAPPOP>Description: {{IETF RFC|2595}}</ref>
<ref name=M2STLS>Opera Mail does not support STARTTLS command on special ports, like 995 for pop3 connection</ref>
<ref name=OCSP>[[Online Certificate Status Protocol]] - Description: {{IETF RFC|2560}}</ref>
<ref name=CRL>[[Certificate revocation list]] - Description: {{IETF RFC|3280}}</ref>
<ref name=TBCSP>Since version 4.2, The Bat! supports two modes of X.509 certificate handling: Internal Implementation and via [[Microsoft CryptoAPI]]. CRLs and OCSP are only supported in the latter mode during TLS connections.</ref>
}}

==Features==

Information on what features each of the clients support.

===General features===

For all of these clients, the concept of "HTML support" does not mean that they can process the full range of HTML that a web browser can handle. Almost all email readers limit HTML features, either for security reasons, or because of the nature of the interface. CSS and JavaScript can be especially problematic.
{{sort-under}}
{| class="wikitable sortable sort-under sticky-header-multi"
|-
! rowspan="2" | Client
! rowspan="2" {{verth|va=middle|[[HTML email]]}}
! rowspan="2" {{verth|va=middle|[[UTF-8]] support}}
! rowspan="2" {{verth|va=middle|Image blocking}}
! colspan="2" | [[email spam|Junk]] filtering
! rowspan="2" {{verth|va=middle|[[Phishing]] filtering}}
! rowspan="2" {{verth|va=middle|Thread view}}
! rowspan="2" {{verth|va=middle|Conversation view}}
! colspan="2" | [[Pretty Good Privacy|PGP]] support
! colspan="4" | [[S/MIME]] support
|-
! local
! server- side
! inline
! PGP/MIME or OpenPGP
! protocol
! [[OCSP]]
! [[Certificate revocation list|CRL]]
! certificates on tokens,<br/>smartcards support
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{partial|Read only}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Apple Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Canary Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}} {{r|group=Note|CITADELspam}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| {{partial|Read-only}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[eM Client]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[EmailTray]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| {{yes}}
| {{no}}
| {{yes}}
| {{included|Pro only}}
| {{included|Pro only}}
| {{dunno}}
| {{yes}}
| {{No}}
| {{yes}} {{r|group=Note|EUDORAPGP}}
| {{yes}} {{r|group=Note|EUDORAPGP}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Gnus]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
|-
! {{rh}} | [[GroupWise]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{partial|Read-only}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[HCL Notes]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|NotesThread}}
| {{dunno}}
| {{yes}}
| {{yes}} <br />''(4.1.2+)''
| {{yes}}
| {{yes}}<ref>{{Cite web|url=http://publib-b.boulder.ibm.com/lotus/c2359840.nsf/b3266a3c17f9bb7085256b870069c0a9/9b7f328aa2eacd9385257361004fd8a4?OpenDocument|title=HCL Product Documentation}}</ref>
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[KMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}} <br />''(with GPG)''
| {{yes}} <br />''(1.5+, with GPGME)''
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh2}} | [[Mailbird]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Mailpile]]
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} (2010+)<ref>{{Cite web |url=http://www.howtogeek.com/howto/17937/sort-your-emails-by-conversation-in-outlook-2010/ |title=Sort Your Emails by Conversation in Outlook 2010 - How-To Geek |access-date=2011-04-12 |archive-date=2011-06-25 |archive-url=https://web.archive.org/web/20110625114031/http://www.howtogeek.com/howto/17937/sort-your-emails-by-conversation-in-outlook-2010 |url-status=dead }}</ref>
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| {{yes}}
| {{yes}} {{r|group=Note|MTBUTF8}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|MTB15}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|MTBPGP}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}} {{r|group=Note|MulberryEncryption}}
| {{yes}} {{r|group=Note|MulberryEncryption}}
| {{yes}} {{r|group=Note|MulberryEncryption}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{partial|Read-only}}
| {{yes}}
| style="background: #ffffdd;" | Yes<br />''(no support for images)''
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}} (with [[GPGME]])
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | Opera Mail
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Outlook Express]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}} {{r|group=Note|OEPGP}}
| {{no}} {{r|group=Note|OEPGPMIME}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| style="background: #ffffdd;" | Yes<br />''(sending is broken)''
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{partial|Read-only}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}} <br />''(with Pine Privacy Guard)''
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pocomail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[RoundCube]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} (depends on antivirus)
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}} {{r|group=Note|MTBPGP}}
| {{yes}} {{r|group=Note|MTBPGP}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
|-
! {{rh}} | [[SquirrelMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} (depends on antivirus)
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| {{no}} {{r|group=Note|SYLHTML}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[The Bat!]]
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|TBIMAGE}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{partial}} {{r|group=Note|TBCRL}}
| {{partial}} {{r|group=Note|TBCRL}}
| {{yes}} {{r|group=Note|TBCRL}}
|-
! {{rh}} | [[Trojitá]]
| {{partial|Read only}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{partial|Read only}}
| {{partial|Read only}}
| {{partial|Read only}}
| {{partial|Read only}}
| {{partial|Read only}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{partial|Read-only}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Mail]]
| {{Yes}}
| {{yes}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Zimbra]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} (depends on antivirus)
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{No}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|
|-class="sortbottom"
! rowspan="2" | Client
! rowspan="2" {{verth|va=middle|HTML email}}
! rowspan="2" {{verth|va=middle|[[UTF-8]] support}}
! rowspan="2" {{verth|va=middle|Image blocking}}
! colspan="2" | [[email spam|Junk]] filtering
! rowspan="2" {{verth|va=middle|[[Phishing]] filtering}}
! rowspan="2" {{verth|va=middle|Thread view}}
! rowspan="2" {{verth|va=middle|Conversation view}}
! colspan="2" | [[Pretty Good Privacy|PGP]] support
! colspan="4" | [[S/MIME]] support
|-class="sortbottom"
! local
! server- side
! inline
! PGP/MIME or OpenPGP
! protocol
! [[OCSP]]
! [[Certificate revocation list|CRL]]
! certificates on tokens,<br/>smartcards support
|}
{{reflist|group=Note|refs=
{{#tag:ref|The Bat! supports two modes of S/MIME: Internal Implementation and via [[Microsoft CryptoAPI]].<ref>{{cite web |url=http://www.ritlabs.com/en/products/thebat/features.php |title=List of features of The Bat! email client}}</ref> CRLs and OCSP are only supported in the latter mode. Internal implementation only supports Aladdin eToken Pro or Rainbow iKey1000<ref>{{cite web |url=http://www.ritlabs.com/en/products/securebat/ |title=The Bat! with Hardware Tokens}}</ref> tokens and can import certificates (from PKCS#12/PFX format) which were created outside The Bat!. CryptoAPI supports any kind of tokens and smart cards which have a corresponding [[Cryptographic Service Provider]] installed.|name=TBCRL|group=Note}}
<ref name=CITADELspam>Citadel plugs Mail into [[SpamAssassin]]</ref>
<ref name=EUDORAPGP>Eudora requires a plugin to handle PGP.</ref>
<ref name=MTBUTF8>Although Thunderbird supports UTF-8, its handling of line wraps causes problems with long lines of text that don't contain spaces, which essentially makes it unusable for certain languages (e.g. Chinese, Japanese, Korean) [https://bugzilla.mozilla.org/show_bug.cgi?id=653342]</ref>
<ref name=MTB15>Mozilla Thunderbird adds this feature in Thunderbird 1.5.0.4</ref>
<ref name=MTBPGP>Using PGP in Thunderbird before version 78 requires [[Enigmail]].</ref>
<ref name=MulberryEncryption>PGP/GPG and S/MIME support require a free (included) plugin.</ref>
<ref name=NotesThread>First release 6.0 (September 2003), [http://www-128.ibm.com/developerworks/lotus/library/notes-designer7-features/] enhancements introduced in release 7.0 (August 2005)</ref>
<ref name=OEPGP>Using PGP in Outlook Express requires a plugin.</ref>
<ref name=OEPGPMIME>Outlook Express [[Outlook Express#Handling of PGP.2FMIME signed messages|does not display]] PGP/MIME signed messages.</ref>
<ref name=SYLHTML>Sylpheed has some limited ability to show HTML email. It can show the plain text that's left after stripping away all the HTML tags. Sylpheed has no ability to compose HTML.</ref>
<ref name=TBIMAGE>The Bat is not able to display inline images.</ref>
<!-- Unused notes
<ref name=MAILPGP>Mail requires [https://gpgtools.org/] GPGMail plugin.</ref> -->
}}

===Messages features===
{{sort-under}}
{| class="wikitable sortable sort-under sticky-header-multi"
|-
! rowspan="2" | Client
! colspan="4" | Label messages
! colspan="2" | Reformat received messages
! rowspan="2" {{verth|va=middle|[[Right-to-left|Bi-directional text support]]}}
! colspan="3" | Composing messages
! colspan="5" | Native images preview
! rowspan="2" {{verth|va=middle|Postpone/scheduled<br/>message sending}}
! colspan="7" | Native documents preview
|-
! {{verth|va=middle|with colors}}
! {{verth|va=middle|with flag}}
! {{verth|va=middle|antidelete}}
! {{verth|va=middle|add note}}
! {{verth|va=middle|edit headers<br/>(e.g., Subject)}}
! {{verth|va=middle|forced recode<br/>{{r|group=Note|recode}}}}
! {{verth|va=middle|[[Spell checker|Spell checking]]}}
! {{verth|va=middle|[[Signature block|Signatures]]}}
! {{verth|va=middle|[[Posting style|Bottom-posts<br/>replies]]}}
! [[JPEG|jpeg]]
! [[GIF|gif]]
! [[Windows bitmap|bmp]]
! [[Portable Network Graphics|png]]
! others
! [[Text file|txt]]
! [[Portable Document Format|pdf]]
! [[DOC (computing)|doc]]
! [[Microsoft Excel|xls]]
! [[OpenDocument|odt]]
! [[OpenDocument|ods]]
! others
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Canary Mail]]
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}<!-- edit headers-->
| {{yes}}<!-- recode -->
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes|with a plugin}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[eM Client]]
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}<!-- edit headers-->
| {{no}}<!-- recode -->
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[EmailTray]]
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}<!-- edit headers-->
| {{no}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{Yes}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes| [[QuickTime]]}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{no}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Gnus]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes|[[X PixMap|XPM]]}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[GroupWise]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}} 
| {{no}}
| {{yes}}
| {{yes}} 
| {{yes}}
| {{yes}}
| {{yes}} 
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}} {{r|group=Note|SCRIBE_spell}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|SCRIBE_jpeg}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|SCRIBE_png}}
| {{yes|[[ICO (icon image file format)|ICO]], [[Tagged Image File Format|TIFF]]}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[HCL Notes]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes|[[Computer Graphics Metafile|CGM]], Lotus PIC, [[PCX]], [[Tagged Image File Format|TIFF]]}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[KMail]]
| {{Yes}}<br/><ref>{{cite web |url=https://docs.kde.org/trunk5/en/pim/kmail2/configure-appearance.html |title=Configure KMail: Appearance Page |website=KDE |type=Documentation page |archive-url=https://web.archive.org/web/20180530222937/https://docs.kde.org/trunk5/en/pim/kmail2/configure-appearance.html |archive-date=May 30, 2018 |url-status=live |access-date=May 30, 2018}}</ref>
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Mailbird]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{Yes}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | [[Mailpile]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{Yes}}<br/>{{r|group=Note|eragenotes}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes|with a plugin}}
| {{yes}}
| {{yes}}
| {{yes|2010}}
| {{yes|2010}}
| [[Microsoft Powerpoint|PowerPoint]]
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{partial|with a plugin}}<ref>{{Cite web|url=https://addons.thunderbird.net/addon/header-tools-lite/|title=Header Tools Lite|date=8 September 2022 }}</ref>
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|Thunderbird_reply_format}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes|[[ICO (icon image file format)|ICO]]}}
| {{yes}} {{r|group=Note|TbirdSl8Tr}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes|postpone}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | Opera Mail
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes|[[APNG]], [[ICO (icon image file format)|ICO]], [[Scalable Vector Graphics|SVG]], [[Wireless Application Protocol Bitmap Format|WBMP]], [[X BitMap|XBM]], [[WebP]]}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Outlook Express]]
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes|[[ICO (icon image file format)|ICO]], art}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes|in index}}<!-- edit headers-->
| {{no}}<!-- recode -->
| {{no}}
| {{yes}}
| {{yes}}
| {{no}} {{r|group=Note|Pegasus_reply_format}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{Yes}}
| {{yes|[[Tagged Image File Format|TIFF]]}}
| {{N/A}}
| {{yes}}<!-- display txt-->
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes|[[Rich Text Format|RTF]], [[HTML]]}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{no}}<!-- edit headers-->
| {{yes|with a patch}} {{r|group=Note|PINE_recode}}<!-- recode -->
| {{dunno}}
| {{yes}} {{r|group=Note|PINE_spell}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pocomail]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[RoundCube]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SquirrelMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | [[The Bat!]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes|[[ICO (icon image file format)|ICO]], [[Windows Metafile|emf]]}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Trojitá]]
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}<!-- edit headers-->
| {{no}}<!-- recode -->
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Zimbra]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}<!-- edit headers-->
| {{dunno}}<!-- recode -->
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-class="sortbottom"
! rowspan="2" | Client
! colspan="4" | Label messages
! colspan="2" | Reformat received messages
! rowspan="2" {{verth|va=middle|[[Right-to-left|Bi-directional text support]]}}
! colspan="3" | Composing messages
! colspan="5" | Native images preview
! rowspan="2" {{verth|va=middle|Postpone/scheduled<br/>message sending}}
! colspan="7" | Native documents preview
|-class="sortbottom"
! {{verth|va=middle|with colors}}
! {{verth|va=middle|with flag}}
! {{verth|va=middle|antidelete}}
! {{verth|va=middle|add note}}
! {{verth|va=middle|edit headers<br/>(e.g., Subject)}}
! {{verth|va=middle|forced recode<br/>{{r|group=Note|recode}}}}
! {{verth|va=middle|[[Spell checker|Spell checking]]}}
! {{verth|va=middle|[[Signature block|Signatures]]}}
! {{verth|va=middle|[[Posting style|Bottom-posts<br/>replies]]}}
! [[JPEG|jpeg]]
! [[GIF|gif]]
! [[Windows bitmap|bmp]]
! [[Portable Network Graphics|png]]
! others
! [[Text file|txt]]
! [[Portable Document Format|pdf]]
! [[DOC (computing)|doc]]
! [[Microsoft Excel|xls]]
! [[OpenDocument|odt]]
! [[OpenDocument|ods]]
! others
|}
{{reflist|group=Note|refs=
<ref name=recode>It's a frequent problem for people dealing with [[Cyrillic]]/[[Russian language|Russian]] in email messages that the message is not encoded in the encoding declared in its headers and thus can't be read. With such a message (with a wrong declaration of the encoding), it well might be the case that it passed through several incorrect recoding stages while it was being sent and delivered; thus it's not possible to correctly render it and read it if one uses the common type of the interface for choosing the encoding (such as the menu in [[Mozilla Firefox]]). An example of such a complex case of a wrongly declared encoding: a message was entered through a webform in the [[windows-1251]] encoding, but the web interface incorrectly assumed that it was in [[latin-1]]; based on this assumption, it performed the recoding from latin-1 to [[utf-8]]. The result of this operation cannot be correctly decoded through the common encoding-selection interface; it can only be decoded through a two-stage recoding: first from utf-8 to latin-1, then from windows-1251 to utf-8 (assuming that one works in a Unicode environment). After it is decoded, it is desirable to store it in the recoded form instead of the original, in order to be able to read it easily afterwards, and to quote it for replies.</ref>
<ref name=PINE_spell>Pine supports full integration with [[GNU Aspell]] or other external speller, which is its requirement for spell checking.</ref>
<ref name=PINE_recode>The recoding engine and interface extensions that would solve the described recoding problems have been developed as a patch for Pine; it is to be found in the package [http://sisyphus.ru/en/srpm/Branch3/pine/get pine-4.58L-alt4.src.rpm] {{Webarchive|url=https://web.archive.org/web/20110827084354/http://sisyphus.ru/en/srpm/Branch3/pine/get |date=2011-08-27 }}([http://ftp.altlinux.org/pub/distributions/ALTLinux/3.0/files/SRPMS/pine-4.58L-alt4.src.rpm ftp]) for [[ALTLinux]] (under the name <code>[http://sisyphus.ru/en/srpm/Branch3/pine/patches/1 pine-4.58L-alt2-0.4.1.diff]</code>). Its essential feature is to enable to forcibly recode messages, save them in the recoded form, and quote in replies.</ref>
<ref name=SCRIBE_spell>i.Scribe / InScribe supports full integration with [[GNU Aspell]], which is its requirement for spell checking.</ref>
<ref name=SCRIBE_jpeg>i.Scribe / InScribe requires [[libjpeg]].</ref>
<ref name=SCRIBE_png>i.Scribe / InScribe requires [[libpng]].</ref>
<ref name=eragenotes>Entourage can link a message to a note.</ref>
<ref name=TbirdSl8Tr>Thunderbird requires SL8TR extension.</ref>
<ref name=Thunderbird_reply_format>Configurable to start replies at top or bottom, with separate configuration of signature position</ref>
<ref name=Pegasus_reply_format>Starts replies with cursor at top, but is configurable regarding whether to include a blank space at the top for replies or not; some interleaved-posting users prefer starting the cursor at the top so they can trim the quotes</ref>
}}

===Database, folders and customization===
{{sort-under}}
{| class="wikitable sortable sort-under sticky-header-multi"
|-
! rowspan="2" | Client
! rowspan="2" | Message file format
! rowspan="2" | Encrypted database
! rowspan="2" | [[Virtual folder]]s
! rowspan="2" {{verth|va=middle|Scheduled backup}}
! colspan="4" | New mail notification
! rowspan="2" {{verth|va=middle|Customizable<br/>interface}}
! rowspan="2" {{verth|va=middle|Customizable<br/>keybindings}}
! rowspan="2" {{verth|va=middle|Fragmented messages<br/>{{r|group=Note|FragmentedMessages}}}}
! rowspan="2" {{verth|va=middle|Database search<br/>with [[regular expression]]s<br/>support}}
! rowspan="2" | [[Indexed search]]
! rowspan="2" | Search folders {{r|group=Note|Searchfolders}}
! colspan="4" | IMAP
|-
! {{verth|va=middle|ticker}}
! {{verth|va=middle|tray icon}}
! {{verth|va=middle|tooltip}}
! {{verth|va=middle|sound}}
! {{verth|va=middle|Search}}
! {{verth|va=middle|IDLE}}
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| [[mbox]], mbx, [[MIX (email)|MIX]], [[maildir]] (with patches), [[MMDF]], tenex, mtx, [[MH Message Handling System|MH]], mx, news, phile
| {{dunno}}
| {{yes}}
| {{partial}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| [[mbox]]
| {{dunno}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Canary Mail]]
| {{Proprietary}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| [[MH Message Handling System|MH]], [[mbox]] (plugin)
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{yes}}
| {{no}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| [[Proprietary format|Proprietary]]
| {{yes}} (weak)
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}} (layout)
| {{no}}
| {{dunno}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[eM Client]]
| [[Proprietary format|Proprietary]] ([[sqlite]])
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[EmailTray]]
| [[Proprietary format|Proprietary]]
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| [[mbox#Modified mbox|modified mbox]]
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{Specify|date=January 2007}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| [[maildir]], [[mbox]], [[MH Message Handling System|MH]]
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{partial}}
| {{yes}} {{r|group=Note|Keybindings}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Gnus]]
| babyl, [[maildir]], [[mbox]], [[MMDF]], news, rnews, SOUP, outlook, oe-dbx
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}<br/>{{refn|group=Note|name=GnusNNIR|Via <code>nnir</code> backends such as Notmuch<ref name="notmuch">{{cite web
|url=http://gnus.org/manual/gnus_108.html#nnir
|title=The Gnus Newsreader
|publisher=Free Software Foundation, Inc.
|year=2015
|access-date=2016-11-21
|first=Lars Magne
|last=Ingebrigtsen
}}</ref>}}
| {{yes}}
| {{yes}}
| {{dunno}}
|-
! {{rh}} | [[GroupWise]]
| [[Proprietary format|Proprietary]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| Proprietary
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[IBM Lotus Notes|IBM Notes]]
| Proprietary
| {{yes}}<ref>{{Cite web|url=http://www.ibm.com/developerworks/lotus/library/ls-Notes_Encryption/#N10102|title = Find product documentation and support|website = [[IBM]]}}</ref>
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|Lotus_frag}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
|-
! {{rh}} | [[KMail]]
| [[mbox]], [[maildir]]
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mailbird]]
| Proprietary
| {{no}}
| {{Yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{No}}
| {{yes}}
| {{Partial}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
|-
! {{rh}} | [[Mailpile]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
| Proprietary ([[Personal Storage Table]])
| {{dunno}}
| {{Yes}}
| {{Partial}} {{r|group=Note|eragebackups}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Partial}}
| {{No}}
| {{No}}
| {{Partial}} {{r|group=Note|eragedbgrepsearch}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
| Proprietary ([[Personal Storage Table]])
| {{Yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{yes}} {{r|group=Note|MSO}}
| {{yes}}
| {{dunno}}
| {{yes}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| [[mbox]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
| [[mbox]], [[maildir]]
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}} {{r|group=Note|TBThemes}}
| {{dunno}}
| {{no}}
| {{dunno}}
| {{yes}} (as of 3.0)
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| [[mbox]] {{r|group=Note|MulberryMBox}}
| {{partial}} {{r|group=Note|MulberryDB}}
| {{partial}} {{r|group=Note|MulberryDB}}
| {{partial}} {{r|group=Note|MulberryDB}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}} {{Specify|date=January 2007}}
| {{partial}} {{r|group=Note|MulberryDB}}
| {{no}}
| {{yes}}
| {{no}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| [[mbox]], [[MMDF]], [[MH Message Handling System|MH]], [[maildir]]
| {{yes}} (with compressed folders patch<ref>{{Cite web|url=http://www.spinnaker.de/mutt/compressed/|title=Compressed folders patch for Mutt}}</ref>)
| {{dunno}} (has limit command)
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}<br/>{{refn|group=Note|name=muttindexers|Via Notmuch or other indexers.<ref>[https://notmuchmail.org/notmuch-mutt/ Using Notmuch with bare Mutt, the old fashioned way]</ref><ref>{{Cite web |url=http://dev.mutt.org/trac/wiki/UseCases/SearchingMail |title=MuttWiki: UserCases/SearchingMail |access-date=2013-02-13 |archive-url=https://web.archive.org/web/20131210072700/http://dev.mutt.org/trac/wiki/UseCases/SearchingMail |archive-date=2013-12-10 |url-status=dead }}</ref>}}
| {{yes}}<br/>{{r|group=Note|muttindexers}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Netscape Messenger]]
| [[mbox]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| [[mbox]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| MH
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | Opera Mail
| [[mbox]], [[MH Message Handling System|MH]], Proprietary
| {{no}}
| {{yes}}<br />''(all folders are virtual)''
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
|-
! {{rh2}} | [[Outlook Express]]
| Proprietary
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{yes}}
|-
! {{rh}} | [[Pegasus Mail]]
| Proprietary (mbox-like)
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}<ref>{{cite web |url=http://community.pmail.com/forums/post/17967.aspx |title=Pegasus Mail & Mercury - Re: IDLE |accessdate=2014-03-11 |url-status=dead |archiveurl=https://web.archive.org/web/20140311181717/http://community.pmail.com/forums/post/17967.aspx |archivedate=2014-03-11 }}</ref>
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| [[mbox]], mbx, [[MIX (email)|MIX]], [[maildir]] (with patches), [[MMDF]], tenex, mtx, [[MH Message Handling System|MH]], mx, news, phile
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
|-
! {{rh2}} | [[Pocomail]]
| mbox
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[RoundCube]]
| [IMAP Server]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{No}}
| {{No}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| [[Proprietary format|Proprietary]] ([[sqlite]])
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| [[mbox]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[SquirrelMail]]
| [IMAP Server]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{No}}
| {{No}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| [[MH Message Handling System|MH]]
| {{no}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}} {{r|group=Note|GrepMH}}
| {{no}} {{r|group=Note|GrepMH}}
| {{yes}}
| {{dunno}}
| {{no}}
|-
! {{rh}} | [[The Bat!]]
| Proprietary
| style="background: #ddffdd;" | Yes ([[AES 128]] bit)
(with Pro and Voyager version) {{r|group=Note|TBEncryptedDB}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
([[PCRE]] 6.2)
| {{no}}
| {{yes}}
| {{yes}}
| {{yes}}
|-
! {{rh}} | [[Trojitá]]
| [[IMAP]]
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| Proprietary
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Live Mail]]
| File System (.eml)
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| [[mbox]], [[maildir]], oe-dbx
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Zimbra]]
| [[File system]]
| {{No}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
|-class="sortbottom"
! rowspan="2" | Client
! rowspan="2" | Message file format
! rowspan="2" | Encrypted database
! rowspan="2" | [[Virtual folder]]s
! rowspan="2" {{verth|va=middle|Scheduled backup}}
! colspan="4" | New mail notification
! rowspan="2" {{verth|va=middle|Customizable<br/>interface}}
! rowspan="2" {{verth|va=middle|Customizable<br/>keybindings}}
! rowspan="2" {{verth|va=middle|Fragmented messages<br/>{{r|group=Note|FragmentedMessages}}}}
! rowspan="2" {{verth|va=middle|Database search<br/>with [[regular expression]]s<br/>support}}
! rowspan="2" | [[Indexed search]]
! rowspan="2" | Search folders {{r|group=Note|Searchfolders}}
! colspan="4" | IMAP
|-
! {{verth|va=middle|ticker}}
! {{verth|va=middle|tray icon}}
! {{verth|va=middle|tooltip}}
! {{verth|va=middle|sound}}
! {{verth|va=middle|Search}}
! {{verth|va=middle|IDLE}}
|}
{{reflist|group=Note|refs=
<ref name=Lotus_frag>Fragmented messages are called ''truncated document'' in Lotus Notes.</ref>
<ref name=MulberryDB>Mulberry is a dedicated IMAP client; If the IMAP server has these abilities, Mulberry can use them.</ref>
<ref name=MulberryMBox>This is for Mulberry's 'offline browsing' capability, which is turned off by default. In the default configuration no local copy of the mail is created.</ref>
<ref name=Searchfolders>Search Folders are virtual folders that contain views of all email items matching specific search criteria. Search Folders display the results of previously defined search queries.</ref>
<ref name=Keybindings>Editable keybindings is part of GNOME, provided "Editable menu accelerators" is enabled in GNOME's "Menus & Toolbars" control applet.</ref>
<ref name=FragmentedMessages>Fragmented messages make it possible, for example, to send a large audio message as several partial messages, and still have it appear to the recipient as a simple audio message rather than as an encapsulated message containing an audio message. {{IETF RFC|2046}}</ref>
<ref name=GrepMH>Because MH stores each letter in a separate file, it is trivially easy to (externally) search them with grep. This ease is shattered when non-raw encodings are used, such as base64.</ref>
<ref name=TBEncryptedDB>The Bat! Pro support two methods access to program when database is encrypted: password authorization and token authorization; Voyager support only password authorization and encrypted database is default and only available storage method.</ref>
<ref name=TBThemes>Thunderbird's interface can be user customized via the use of themes (which can reposition and skin controls)</ref>
<ref name=MSO>supported since [[Microsoft Office 2007|Office 2007]].</ref>
<ref name=eragebackups>With Entourage 2008, you can use AppleScript and various internal/external scheduling mechanisms to create timed backups of Entourage Data.</ref>
<ref name=eragedbgrepsearch>With Entourage 2008 and later versions of 2004, you can use the Spotlight data to search what's in the Entourage database via regular expression in the file system in Terminal or via Spotlight's ...interesting...version of "regular expressions".</ref>
<!---Unused notes
<ref name=MSO_enc> when best encryption is used, .pst file cannot be read by a [[hex editor]].</ref>
<ref name=Mail_search>with Spotlight macOS v. 10.4</ref>
<ref name=Mail_search2>Search folders is called ''Smart Folders'' in Mail on macOS v. 10.4.</ref>
--->
}}

===Templates, scripts and programming languages===
{{sort-under}}
{| class="wikitable sortable sort-under sticky-header-multi"
|-
! rowspan="2" style="width:12em" | Client
! colspan="6" | Message templates
! rowspan="2" style="width:12em" | Message templates individual for
! colspan="7" | Support in message templates scripts, programming languages
|-
! new
! reply
! forward
! read confirmation
! save
! print
! [[JavaScript]]
! [[VBScript]]
! [[PHP]] Scripts
! [[Python (programming language)|Python]]
! [[Regular expression]]s
! [[Java (programming language)|Java]]
! Other (specify)
|-
! {{rh}} | [[Alpine (email client)|Alpine]]
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{any}}
| {{No}}
| {{No}}
| {{No}}
| {{No}}
| {{dunno}}
| {{No}}
| {{dunno}}
|-
! {{rh}} | [[Becky!|Becky! Internet Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{any}}<br />account<br />folder<br />
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Canary Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|*
|-
! {{rh}} | [[Citadel/UX|Citadel]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Claws Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| account<br />folder<br />
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes|[[Perl]]}}
|-
! {{rh2}} | [[Courier (email client)|Courier]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Elm (email client)|Elm]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[eM Client]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| account
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Eudora (email client)|Eudora]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{any}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Evolution (software)|Evolution]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Gnus]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{no}}
| {{yes|[[elisp]]}}
|-
! {{rh}} | [[GroupWise]]
| {{yes}}
| {{no}}
| {{no}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Hiri (email client)|Hiri]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{yes}}
| {{yes}}
| {{any}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh}} | [[Scribe Mail|i.Scribe / InScribe]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{any}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes|Internal macros (similar to JavaScript)}}
|-
! {{rh}} | [[IBM Lotus Notes|IBM Notes]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}<ref>{{Cite web|url=http://publib.boulder.ibm.com/infocenter/domhelp/v8r0/index.jsp?topic=/com.ibm.help.domino80x.doc/DOC/H_CREATE_A_RECOGNIZER_OVER.html|title = IBM Docs}}</ref>
| {{yes}}
| {{yes|[[LotusScript]], [[Formula language]]}}
|-
! {{rh}} | [[KMail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{no}}
| {{no}}
| {{CNone|none}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mailpile]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Microsoft Entourage]]
|{{yes}}
|{{yes}}
|{{yes}}
|{{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{Yes|[[AppleScript]], [[Apple Automator|Automator]]}}
|-
! {{rh}} | [[Microsoft Office Outlook]]
|{{yes}}
|{{yes}}
|{{yes}}
|{{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{dunno}}
| {{no}}
| {{dunno}}
| {{no}}
| {{dunno}}
|-
! {{rh2}} | [[Mozilla Mail & Newsgroups]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mozilla Thunderbird]]
|{{yes}}
| {{yes}}{{r|group=Note|TB_STATIONERY_EXT}}
| {{yes}}{{r|group=Note|TB_STATIONERY_EXT}}
| {{yes}}
| {{yes}}
| {{yes}}
| profile
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Mulberry (email client)|Mulberry]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Mutt (email client)|Mutt]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{any}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes}}
| {{dunno}}
| {{yes|Internal macros}}
|-
! {{rh2}} | [[Netscape Messenger]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Netscape Messenger 9]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[MH Message Handling System|nmh / MH]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | Opera Mail
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{n/a}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
|-
! {{rh2}} | [[Outlook Express]]
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[Pegasus Mail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Pine (email client)|Pine]]
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{any}}
| {{dunno}}
| {{No}}
| {{No}}
| {{dunno}}
| {{dunno}}
| {{No}}
| {{dunno}}
|-
! {{rh2}} | [[Pocomail]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{yes|PocoScript}}
|-
! {{rh}} | [[RoundCube]]
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | [[SeaMonkey]] Mail & Newsgroups
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[SquirrelMail]]
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
|-
! {{rh}} | [[Sylpheed]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[The Bat!]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| {{yes}}
| account<br />folder<br />address book group<br />contact
| {{yes}} {{r|group=Note|BAT_js}}
| {{yes}} {{r|group=Note|BAT_XMP}}
| {{yes}} {{r|group=Note|BAT_XMP2}}
| {{yes}} {{r|group=Note|BAT_TBPyxie}}
| {{yes}}
| {{yes|[[PCRE]] 6.2}}
| {{yes|Internal and plugins macros}}
|-
! {{rh2}} | [[Turnpike (software)|Turnpike]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Live Mail]]
| {{yes}}{{r|group=Note|STATIONERY}}
| {{yes}}{{r|group=Note|STATIONERY}}
| {{dunno}}
| {{yes}}{{r|group=Note|STATIONERY}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{yes}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh2}} | [[Windows Mail]]
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
| {{dunno}}
|-
! {{rh}} | [[YAM (Yet Another Mailer)|YAM]]
| {{yes}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{yes}}
| {{yes}}
| {{dunno}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
| {{yes|[[ARexx]]}}
|-
! {{rh}} | [[Zimbra]]
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{Yes}}
| {{any}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{no}}
| {{dunno}}
| {{dunno}}
|-class="sortbottom"
! rowspan="2" style="width:12em" | Client
! colspan="6" | Message templates
! rowspan="2" style="width:12em" | Message templates individual for
! colspan="7" | Support in message templates scripts, programming languages
|-class="sortbottom"
! new
! reply
! forward
! read confirmation
! save
! print
! [[JavaScript]]
! [[VBScript]]
! [[PHP]] Scripts
! [[Python (programming language)|Python]]
! [[Regular expression]]s
! [[Java (programming language)|Java]]
! Other (specify)
|}
{{reflist|group=Note|refs=
<ref name=BAT_js>The Bat! supports JavaScript in message templates with the JavaScript Macro plugin.</ref>
<ref name=BAT_XMP>The Bat! supports VBScript in message templates with the XMP plugin.</ref>
<ref name=BAT_XMP2>The Bat! supports PHP in message templates with the XMP plugin.</ref>
<ref name=BAT_TBPyxie>The Bat! supports Python in message templates with the TBPyxie plugin.</ref>
<ref name=STATIONERY>Weak "stationery" system that only accept pages done with [[Microsoft Word|Word]].</ref>
<ref name=TB_STATIONERY_EXT>Thunderbird supports HTML templates with "Stationery" add-on.</ref>
}}

==Internationalization==
{{Disputed section|International email|date=April 2021}}
[[The Bat!]] supports [[Email Address Internationalization]] (EAI).<ref>{{cite web |url=http://www.idnnews.com/?p=10045 |title=Starting with the version 6.0 The Bat! supports IDN (Internationalized Domain Names))}}{{better source needed|date=October 2013}}</ref>

As of October 2016, email clients supporting [[SMTPUTF8]] included Outlook 2016,<ref>{{Cite web|url=https://support.office.com/en-US/article/International-email-addresses-303595ea-4893-4b26-9b14-2202c32fea36|title=International email addresses - Outlook|website=support.office.com|access-date=2016-10-27|archive-url=https://web.archive.org/web/20161028083946/https://support.office.com/en-US/article/International-email-addresses-303595ea-4893-4b26-9b14-2202c32fea36|archive-date=2016-10-28|url-status=dead}}</ref> mail for iOS, and mail for Android.{{citation needed|date=January 2018}}

==See also==
*[[Comparison of feed aggregators]]
*[[Comparison of browser engines]]
*[[Comparison of mail servers]]
*[[Comparison of webmail providers]]
*[[List of personal information managers]]
*[[Unicode and email]]
*[[Webmail]]

==Notes==
{{notelist}}

==References==
{{reflist}}

==External links==
*[https://web.archive.org/web/20050308144727/http://www.tandb.com.au/email/clients/ T&B : Email : Clients] (of historical interest—last updated in 1999)
*[http://linuxmafia.com/faq/Mail/muas.html Mail User Agents for Linux Based Platforms] (includes many email clients not listed in the above tables)
*[http://www.research.ibm.com/remail/index.html Remail - research by The Collaborative User Experience group] at [[IBM]]

{{Email clients}}

{{DEFAULTSORT:Comparison Of Email Clients}}
[[Category:Network software comparisons|Email clients]]
[[Category:Email clients| ]]

[[sv:E-postprogram#Jämförelse av epostklienter]]