Comparison of email clients

The following tables compare general and technical features of notable email client programs.

General

Basic general information about the clients: creator/company, O/S, licence, & interface.

   No longer in active development

Client	Author/Developer	Operating system	Software license	User Interface
Alpine	University of Washington	Cross-platform	Apache-2.0	TUI
Apple Mail	Apple	macOS, iOS, watchOS	Proprietary	GUI (Cocoa)
Balsa	Stuart Parmenter	Linux	GPL-2.0-or-later	GUI (GTK3)
Becky! Internet Mail	Rimarts	Windows	Proprietary	GUI
BlitzMail	Dartmouth College		BSD licenses	GUI
Canary Mail	Cartasec Pte. Ltd.	Cross-platform	Proprietary	GUI
Citadel	citadel.org	Unix-like	GPL-3.0-only	Webmail
Claws Mail	the Claws Mail team	Cross-platform	GPL-3.0-or-later	GUI (GTK2)
Courier (formerly Calypso)	Micro Computer Systems, Inc., continued by Rose City Software	Windows	Proprietary	GUI
Elm	Dave Taylor, Sydney Weinstein, Bill Pemberton, Michael Elkins, Kari Hurtta	Unix-like	BSD-like^[1]	TUI
eM Client	eM Client Inc.	Windows, macOS	Proprietary	GUI
EmailTray	Internet Promotion Agency S.A.	Windows, Android	Proprietary	GUI
Eudora OSE	Qualcomm	Windows, macOS	Open source	GUI
Evolution	The GNOME Project	Unix-like	LGPL-2.1-only or LGPL-3.0-only	GUI (GTK)
FirstClass	Open Text		Proprietary	GUI
Forté Agent	Mark Sidell	Windows	Proprietary	GUI
Geary	The GNOME Project (formerly Yorba Foundation)	Unix-like	LGPL-2.1-or-later	GUI (GTK)
GNUMail	Ludovic Marcotte and others	Unix-like, macOS	GPL-2.0-or-later	GUI
Gnus	Gnus team	Cross-platform	GPL-3.0-or-later	TUI and GUI
GroupWise	Micro Focus (formerly Novell)	Cross-platform	Proprietary	GUI
Hiri	Hiri	Cross-platform	Proprietary	GUI
i.Scribe, InScribe	Memecode	Windows, macOS, Linux	GPL-3.0-only	GUI
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)
IMP	Horde LLC	Cross-platform	GPL-2.0-only	Webmail
K-9 Mail	K-9 Dog Walkers: cketti, et al.	Android	Apache-2.0	GUI
KMail	KDE	Cross-platform	GNU General Public License	GUI (Qt)
Mail (Windows)	Microsoft	Windows	Proprietary	GUI
Mailbird	Mailbird	Windows	Proprietary	GUI
Mailpile	Mailpile	Windows, macOS, Linux	AGPL-3.0-or-later	Webmail
mailx	?	Unix-like	BSD Licenses	TUI
Microsoft Entourage	Microsoft	macOS	Proprietary	GUI
Microsoft Outlook	Microsoft	Windows, macOS	Proprietary	GUI
Mozilla Mail & Newsgroups	Mozilla Foundation		Mozilla Public License	GUI (XUL)
Mozilla Thunderbird	Mozilla Foundation	Cross-platform	MPL-2.0	GUI (XUL)
Mulberry	Cyrus Daboo (formerly Cyrusoft International, Inc./ISAMET)	Cross-platform	Apache-2.0	GUI
Mutt	Michael Elkins	Cross-platform	GPL-2.0-or-later	TUI (ncurses)
Netscape Messenger	Netscape Communications		?	GUI
Netscape Messenger 9	Netscape Communications		Mozilla Public License	GUI
Nylas Mail	Nylas	Windows, macOS, Linux	MIT	GUI
nmh / MH	RAND Corporation	Unix-like	BSD Licenses	CLI
Opera Mail	Opera Software	Cross-platform	Proprietary	GUI
Outlook Express	Microsoft	Windows	Proprietary	GUI
Pegasus Mail	David Harris	Windows	Proprietary	GUI
Pine	University of Washington	Cross-platform	Freeware^[2]	TUI
Pocomail	Poco Systems	Windows	Proprietary	GUI
RoundCube	The RoundCube Team	Cross-platform	GPL-3.0-or-later	Webmail
Samsung Email	Samsung Electronics	Samsung, Android 8+	Proprietary	GUI
SeaMonkey Mail & Newsgroups	SeaMonkey Council	Cross-platform	MPL-2.0	GUI (XUL)
Spark	Readdle	macOS	Proprietary	GUI
SquirrelMail	The SquirrelMail Project Team	Cross-platform	GPL-2.0-or-later	Webmail
Superhuman	Rahul Vohra	Cross-platform	Proprietary	Webmail
Sylpheed	Hiroyuki Yamamoto	Cross-platform	Sylpheed: GPL-2.0-or-later LibSylph: LGPL-2.1-or-later	GUI (GTK2)
The Bat!	RitLabs	Windows	Proprietary	GUI
Trojitá	KDE	Cross-platform	GPL-2.0-only or GPL-3.0-only^[Note 1]	GUI (Qt)
Turnpike	Thus PLC (Demon Internet)	Windows	Proprietary	GUI
Vivaldi	Vivaldi Technologies AS	Cross-platform	Proprietary	GUI (Chrome)
Windows Live Mail	Microsoft	Windows	Proprietary	GUI
Windows Mail (Vista)	Microsoft	Windows	Proprietary	GUI
YAM	YAM Open Source Team and contributing authors	AmigaOS	GPL-2.0-or-later	GUI
Zimbra Desktop	Zimbra	Cross-platform	Mozilla Public License for server and ZPL for client	GUI
Client	Author/Developer	Operating system	Software license	User interface

1. 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."

Release history

A brief digest of the release histories.

Client	First public Date	First public Version	First stable Date	First stable Version	Latest stable release
Alpine	2006-11	0.8	2007 December	1.00	2.26^[3]   2 June 2022
Apple Mail	2001-03-24	?	?	?	( ())
Becky! Internet Mail	1996	1	?	?	2.81.06^[4]   28 February 2024
Canary Mail	15 June 2017	1.0	15 June 2017	1.0	4.01 (5th June, 2023)
Citadel	1987	?	1988	1.00	996^[5]   29 September 2023
Claws Mail	2001-05	0.4.67	2005-01	1.0.0	4.2.0^[6]   20 November 2023
Courier	2004-06	3.5	discontinued	discontinued	3.5 (June 2004) [±]
Elm	1986	?	1987-03	2	2.5.8^[7]   18 August 2005
eM Client	2007-11	1.0	2007-11	1.0	10.0.2382.0 (May 10, 2024; 18 days ago (2024-05-10)) [±]
EmailTray	2010-10	2.0	2011-03	3.11	4.0 (July 2, 2012; 11 years ago (2012-07-02)) [±]
Eudora	1988^[8]	?	1988^[8]	?	7.1 (Windows), 6.2.4 (Mac OS) (October 11, 2006; 17 years ago (2006-10-11)) [±]
Evolution	2000-05-11	0.0	2001-12-03	1.0	3.52.2^[9]   24 May 2024
Forté Agent	?	?	?	?	8 (October 20, 2014; 9 years ago (2014-10-20)) [±]
Geary	2012	0.1	2012	0.1	44.1^[10]   17 August 2023
Gnus	1987^[11]	?	1988-02-01^[11]	2.0	2015-04-06
GroupWise	?	?	1986	1.0	18.4^[12]   14 March 2022
Hiri	2014-02	0.4	2016-06	1.0	1.0.11 (June 10, 2017; 6 years ago (2017-06-10)) [±]
i.Scribe / InScribe	1999	1.00	?	?	2.3.18 (March 30, 2021; 3 years ago (2021-03-30)) [±]
IBM Lotus Notes	1989	1.0	1989	1.0	14.0.0^[13]   7 December 2023
IMP	?	?	1998	1.0	6.2.27^[14]   27 August 2020
K-9 Mail	?	?	?	?	6.803^[15]   10 May 2024
KMail	1998-10	Alpha	1999-02	1.0.17	5.24.3^[16]   9 November 2023
Mailbird	2013-04-01	Public Beta	?	?	2.9.29 (April 22, 2021; 3 years ago (2021-04-22)) [±]
Mailpile	2011-11	^[17]	^[18]	^[19]	1.0.0rc6 (September 4, 2019; 4 years ago (2019-09-04)^[20]) [±]
Microsoft Entourage	?	?	?	?	2008 (12.3.6) (March 12, 2013; 11 years ago (2013-03-12)) [±]
Microsoft Office Outlook	1997	97	1997	97	Microsoft 365 (Windows) 2404 (Build 17531.20152)^[21] / May 14, 2024; 14 days ago (2024-05-14) Microsoft 365 (Mac) 16.80 (Build 23121017) / December 12, 2023; 5 months ago (2023-12-12)^[22] One-time purchase (Retail) 2021 Version 2311 (Build 17029.20108)^[23] / December 12, 2023; 5 months ago (2023-12-12)^[24] One-time purchase (LTSC) 2021 Version 2108 (Build 14332.20615) / December 12, 2023; 5 months ago (2023-12-12)^[23]
Mozilla Thunderbird	2003-07-28	0.1	2004-12-07	1.0	115.11.0^[25]   14 May 2024
Mulberry	1996-09-20	1.0	1996-09-20	1.0	4.0.8 (February 21, 2007; 17 years ago (2007-02-21)) [±]
Mutt	1995	?	?	?	2.2.13^[26]   9 March 2024
Netscape Messenger	?	?	?	?	7.2 (August 17, 2007; 16 years ago (2007-08-17)) [±]
Netscape Messenger 9	2007-11-15	9.0a1	discontinued	discontinued	2007-11-15
nmh / MH	1979	?	?	?	1.5 (June 11, 2012; 11 years ago (2012-06-11)) [±]
Opera Mail	1996-09	2.1b1	1996-12	2.1	1.0.1044^[27] (February 16, 2016; 8 years ago (2016-02-16)) [±]
Outlook Express	1996	3.0	?	?	6.0 SP3   21 April 2008
Pegasus Mail	1990	?	1990	?	4.80^[28]   14 February 2022
Pine	1992-01-15	2.00	1992-01-15	2.00	4.64^[29]   28 September 2005
Pocomail	1999	?	?	?	4.8 build 4400 (April 6, 2009; 15 years ago (2009-04-06)) [±]
RoundCube	2006	0.1-rc1	2014-04-07	1.0.0	1.6.7^[30]   19 May 2024
SeaMonkey Mail & Newsgroups	2005-09-15	1.0a	2006-01-30	1.0	2.53.18.2^[31]   28 March 2024
SquirrelMail	1999-12	0.1	2001-01	1.0	1.4.22^[32]^[33]   12 July 2011
Sylpheed	2000-01	0.1.0	2004-12	1.0.0	3.7^[34]   31 January 2018
The Bat!	1997-03	1.0 Beta	1998-03	1.00 Build 1310	11.0.3.1^[35]   12 January 2024
Trojitá	2009-08	0.1	2012-12	0.3.90
Turnpike	1996 (circa)	1.0	1996 (circa)	1.0	6.06 (May 23, 2006; 18 years ago (2006-05-23)) [±]
Vivaldi	2015-11-03	Beta 1	2022-06-09	1.0
Windows Live Mail	2007-11-06	12	2007-11-06	12	2012 (v16.4.3528.0331) (November 4, 2014; 9 years ago (2014-11-04)) [±]
Windows Mail	?	?	?	?	2007-01-01
YAM	1995	1.0	1995	1.0	2.9^[36]   24 December 2013
Zimbra	2005-11	Beta	2006-03	3.5	8.6.0^[37] (December 15, 2014; 9 years ago (2014-12-15)) [±]

Operating system support

The operating systems on which the clients can run natively (without emulation).

Client	Microsoft Windows	macOS	Linux	BSD	Unix	DOS	Other
Alpine	Yes	Yes	Yes	Yes	Yes	No	No
Apple Mail	No	Included	No	No	No	No	No
Balsa	No	No	Yes	Yes	No	No	No
Becky! Internet Mail	Yes	No	No	No	No	No	No
Canary Mail	Yes	Yes	No	No	No	No	No
Citadel	No	Yes	Yes	Yes	Yes	No	No
Claws Mail	Yes	Yes	Yes	Yes	Yes	No	No
Courier	Yes	No	No	No	No	No	No
Elm	No	Yes	Yes	Yes	Yes	No	No
eM Client	Yes	Yes	No	No	No	No	No
EmailTray	Yes	No	No	No	No	No	No
Eudora	Yes	Yes	No	No	No	No	No
Evolution	No ^[Note 1]	No	Yes	Yes	Yes	No	No
Forté Agent	Yes	No	No	No	No	No	No
Geary	No	No	Yes	Yes	Yes	No	No
Gnus	Yes	Yes	Yes	Yes	Yes	Yes	No
GroupWise	Yes	Yes	Yes	Yes	No	No	No
Hiri	Yes	Yes	Yes	No	Yes	No	No
i.Scribe / InScribe	Yes	Yes	Yes	No	No	No	No
IBM Lotus Notes	Yes	Yes	Yes	No	Yes	No	No
IMP	Yes	Yes	Yes	Yes	Yes	No	No
KMail	No	Yes	Yes	Yes	Yes	No	No
Mailbird	Yes	Yes	No	No	No	No	No
Mailpile	Yes ^[Note 2]	Yes ^[Note 2]	Yes	Yes ^[Note 3]	Yes ^[Note 3]	No ^[Note 4]	No ^[Note 4]
mailx	No	No	Yes	Yes	Yes	No	No
Microsoft Entourage	No	Terminated (2008)	No	No	No	No	No
Microsoft Office Outlook	Yes	Yes	No	No	No	No	No
Mozilla Mail & Newsgroups	Terminated (1.7.13)					No	No
Mozilla Thunderbird	Yes	Yes	Yes	Yes	Yes	No	No
Mulberry	Yes	Yes	Yes	Yes	Yes	No	No
Mutt	Yes	Yes	Yes	Yes	Yes	Yes^[38]	No
Netscape Messenger	Terminated (4.80)					No	No
Netscape Messenger 9	Terminated (9.0a1)					No	No
nmh / MH	No	Yes	Yes	Yes	Yes	No	No
Opera Mail	Yes	Yes	Yes	Yes	?	No	No
Outlook Express	Included (up to XP)	No	No	No	No	No	No
Pegasus Mail	Yes	No	No	No	No	Yes	NetWare NLM
Pine	Yes	Yes	Yes	Yes	Yes	Terminated (3.96)^[39]	No
Pocomail	Yes	No	No	No	No	No	No
RoundCube	Yes	Yes	Yes	Yes	Yes	No	No
SeaMonkey Mail & Newsgroups	Yes	Yes	Yes	Yes	Yes	No	No
SquirrelMail	Yes	Yes	Yes	Yes	Yes	No	No
Sylpheed	Yes	Yes	Yes	Yes	Yes	No	No
The Bat!	Yes	No	No	No	No	No	No
Trojitá	Yes	Yes	Yes	Yes	Yes	No	MeeGo
Turnpike	Yes	No	No	No	No	No	No
Vivaldi	Yes	Yes	Yes	Yes	Yes	No	No
Windows Live Mail	Yes	No	No	No	No	No	No
Windows Mail	Included (Vista)	No	No	No	No	No	No
YAM	No	No	No	No	No	No	AmigaOS AROS MorphOS
Zimbra	Yes	Yes	Yes	Yes	Yes	No	No
Client	Microsoft Windows	macOS	Linux	BSD	Unix	DOS	Other

1. Development stopped in 2008
2. Packaging planned
3. Free Software project, source available.
4. Free Software porting tangible provided OS has web browser.

Protocol support

Communication and access protocol support

What email and related protocols and standards are supported by each client.

Client	POP3 fetch all messages (RFC 1939)	POP3 selected by filter (RFC 1939)	POP3 selected by user (RFC 1939)	IMAP4 (RFC 3501)	SMTP (RFC 5321)	NNTP (RFC 3977)	LDAP v2 (RFC 4511)	LDAP v3 (RFC 4511)	EWS	IPv6 (RFC 2460)	MAPI
Alpine	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	?
Apple Mail	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	?	Yes	?
Becky! Internet Mail	Yes	Yes	Yes	Yes	Yes	Yes ^[Note 1]	Yes	?	?	?	?
Canary Mail	No	No	No	Yes	Yes	No	No	No	Yes	Yes	No
Citadel	Yes	?	?	Yes	Yes	?	?	?	?	?	?
Claws Mail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	?
Courier	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	?	?	?
Elm	No	No	No	?	?	?	?	?	?	?	?
eM Client	Yes	No	No	Yes	Yes	No	No	No	Yes	Yes	No
EmailTray	Yes	No	No	Yes	Yes	No	No	No	No	No	No
Evolution	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	plug-in	?	plug-in
Gnus	Yes	Yes	Yes^[40]	Yes	Yes	Yes	Yes	Yes	No	Yes	Plug-in^[41]
GroupWise	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes
Hiri	No	No	No	No	No	No	Yes	Yes	Yes	Yes	No
i.Scribe / InScribe	Yes	No	Yes	Yes	Yes	No	Yes ^[Note 2]	Yes ^[Note 2]	No	No	Yes
HCL Notes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No
KMail	Yes	Yes	Yes	Yes	Yes	No ^[Note 3]	Yes	?	?	?	?
Mailbird	Yes	?	?	Yes	Yes	?	Yes	Yes	?	Yes	?
Mailpile	Yes	No	No	Yes	Yes	?	?	?	?	?	?
Microsoft Entourage	Yes	?	?	Yes	Yes	Yes	No	Yes	Partial	?	?
Microsoft Entourage 2008, Web Services Edition	Yes	?	?	Yes	Yes	?	?	Yes	Yes	?	?
Microsoft Office Outlook	Yes	No	No	Yes	Yes	No	Yes	?	Yes	Yes	Yes
Mozilla Mail & Newsgroups	Yes	?	?	?	?	Yes	?	?	?	?	?
Mozilla Thunderbird	Yes	No	No	Yes	Yes	Yes	Partial	Partial^[42]	extensible^[43]	Yes	Yes
Mulberry	Yes	No	No	Yes	Yes	No	Yes	?	?	Yes	Yes
Mutt	Yes	No (possible with POP3 browser)	No (possible with POP3 browser)	Yes	Yes	No (slrn looks alike)	Partial (resolve real names through NSS)	?	?	Yes	?
Netscape Messenger	Yes	?	?	Yes	?	Yes	?	?	?	?	?
Netscape Messenger 9	Yes	?	?	Yes	?	Yes	?	?	?	?	?
nmh / MH	Yes	?	?	No	Yes	?	?	?	No	?	No
Opera Mail	Yes	No	Yes	Yes	Yes	Yes	No	No	?	Yes	Yes
Outlook Express	Yes	No	No	Yes	Yes	Yes	Yes	?	No	?	No
Pegasus Mail	Yes	Yes	Yes	Yes	Yes	Yes ^[Note 4]	Yes	?	?	?	?
Pine	Yes	No	No	Yes	Yes	Yes	Yes	No	?	?	?
Pocomail	Yes	Yes	Yes	Yes	Yes	No	No	No	?	?	?
RoundCube	Yes	No	No	Yes	Yes	No	Yes	Yes	?	?	?
SeaMonkey Mail & Newsgroups	Yes	No	No	Yes	Yes	Yes	Partial	?	?	Yes	?
SquirrelMail	Yes	No	No	Yes	Yes	No	Yes	Yes	?	?	?
Sylpheed	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	No
The Bat!	Yes	Yes ^[Note 5]	Yes ^[Note 6]	Yes	Yes	Yes ^[Note 7]	Yes	No	No	Yes	Yes
Trojitá	No	No	No	Yes	Yes	No	No	No	No	Yes	No
Turnpike	Yes	?	?	?	Yes	Yes	?	?	?	?	?
Vivaldi	Yes	?	?	Yes	Yes	No	?	?	?	Yes
Windows Live Mail	Yes	No	No	Yes	Yes	Yes	Yes	?	No	Yes	No
Windows Mail	Yes	No	No	Yes	Yes	?	?	?	No	Yes	No
YAM	Yes	Yes	Yes	No	Yes	No	No	No	?	?	?
Zimbra	Yes	No	No	Yes	Yes	No	Yes	Yes	?	?	?
Client	POP3 fetch all messages (RFC 1939)	POP3 selected by filter (RFC 1939)	POP3 selected by user (RFC 1939)	IMAP4 (RFC 3501)	SMTP (RFC 5321)	NNTP (RFC 3977)	LDAP v2 (RFC 4511)	LDAP v3 (RFC 4511)	EWS	IPv6 (RFC 2460)	MAPI

Integration protocol support

Client	IMSP ([3])	ACAP (RFC 2244)	RSS 0.91 Feeds	RSS 1.0 Feeds	RSS 2.0 Feeds	ATOM Feeds	iCalendar (RFC 5545)	MAPI/RPC	CalDAV (RFC 4791)	CardDAV (RFC 6352)
Alpine	?	?	?	?	?	?	?	?	?	?
Apple Mail	?	?	?	?	?	?	Yes	?	Yes	Yes
Becky! Internet Mail	?	?	Yes ^[Note 8]	Yes ^[Note 8]	Yes ^[Note 8]	Yes ^[Note 8]	?	?	?	?
Canary Mail	No	No	No	No	No	No	No	No	No	No
Citadel	?	?	?	?	?	?	?	?	?	?
Claws Mail	?	?	No	Yes ^[Note 9]	Yes ^[Note 9]	Yes ^[Note 9]	Yes ^[Note 10]	?	?	?
Courier	No	No	No	No	No	No	No	?	?	?
Elm	?	?	?	?	?	?	?	?	?	?
eM Client	No	No	Yes	Yes	Yes	No	Yes	No	Yes	Yes
EmailTray	No	No	No	No	No	No	No	No	?	?
Eudora	No	Yes	No	No	No	No	No	?	?	?
Evolution	No	No	No ^[Note 11]	No ^[Note 11]	No ^[Note 11]	No	Yes	Yes	Yes	Yes
Gnus	No	No	Yes	Yes	Yes	Yes^[44]	Yes^[45]	Yes	Yes	Yes
GroupWise	?	No	?	?	?	?	Yes	?	?	?
Hiri	No	No	No	No	No	No	No	No	No	No
i.Scribe / InScribe	No	No	No	No	No	No	No	Yes	?	?
IBM Lotus Notes	No	No	Yes ^[Note 12]	Yes	Yes	Yes	Yes	?	?	?
KMail	?	?	Yes ^[Note 13]	Yes ^[Note 13]	Yes ^[Note 13]	Yes ^[Note 13]	Yes ^[Note 14]	?	Yes	Yes
Mailpile	?	?	?	?	?	?	?	?	?	?
Microsoft Entourage	?	?	?	?	?	?	Yes	?	?	?
Microsoft Office Outlook	?	?	Yes ^[Note 15]	Yes ^[Note 15]	Yes ^[Note 15]	Yes ^[Note 15]	Yes ^[Note 16]	Yes	No	No
Mozilla Mail & Newsgroups	?	?	?	?	?	?	?	?	?	?
Mozilla Thunderbird	No	No	Yes	Yes	Yes	Yes	Yes ^[Note 17]	Yes ^[Note 18]	Yes	Yes
Mulberry	Yes	Yes	No	No	No	No	Yes	?	Yes	?
Mutt	?	?	No	No	No	No	No	?	?	?
Netscape Messenger	?	?	?	?	?	?	?	?	?	?
Netscape Messenger 9	?	?	?	?	?	?	?	?	?	?
nmh / MH	?	?	?	?	?	?	?	?	?	?
Opera Mail	?	?	Yes	Yes	Yes	Yes	No	?	No	No
Outlook Express	?	?	No	No	No	No	No	?	No	No
Pegasus Mail	?	?	Yes ^[Note 4]	Yes ^[Note 4]	Yes ^[Note 4]	?	?	?	?	?
Pine	No	No	No	No	No	No	No	?	?	?
Pocomail	No	No	Yes	Yes	Yes	No	No	?	?	?
SeaMonkey Mail & Newsgroups	No	No	Yes	Yes	Yes	Yes	Yes ^[Note 17]	?	?	?
SquirrelMail	?	?	Yes	Yes	Yes	Yes	Yes	Yes	?	?
Sylpheed	No	No	No	No	No	No	No	No	?	?
The Bat!	No	No	Yes ^[Note 19]	Yes ^[Note 19]	Yes ^[Note 19]	Yes ^[Note 19]	No	Yes	?	Yes
Trojitá	No	No	No	No	No	No	No	No	?	?
Turnpike	?	?	?	?	?	?	?	?	?	?
Windows Live Mail	?	?	Yes	Yes	Yes	Yes	No	?	?	?
Windows Mail	?	?	?	?	?	?	?	?	?	?
YAM	No	No	No	No	No	No	No	?	?	?
Zimbra	?	?	Yes	Yes	Yes	Yes	Yes	?	?	?
Client	IMSP ([4])	ACAP (RFC 2244)	RSS 0.91 Feeds	RSS 1.0 Feeds	RSS 2.0 Feeds	ATOM Feeds	iCalendar (RFC 5545)	MAPI/RPC	CalDAV (RFC 4791)	CardDAV (RFC 6352)

1. Becky! requires FRNews or BkNews plugin installed for handling NNTP.
2. i.Scribe / InScribe requires a plugin to handle LDAP.
3. KDE supports Newsgroups (NNTP) by the use of KNode
4. Pegasus Mail can convert Newsgroup messages and/or RSS feeds to emails through the use of free add-ons.
5. 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.
6. 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.
7. The Bat! requires MyGate plugin installed for handling NNTP.
8. Becky! requires BkBlogReader or BkRSSviewer or B.F.R or BkRssReader plugin installed for handling RSS and ATOM.
9. RSSyl plugin is required to read RSS and ATOM in Claws Mail.
10. vCalendar plugin is required to handle iCalendar in Claws Mail.
11. The evolution-rss plugin (provided as a separate package by many distributions provides the RSS functionality in Evolution.
12. Studio Blog Reader is one RSS reader application for IBM Lotus Notes. IBM Lotus Notes version 8.x introduced a native RSS reader.
13. KDE supports feeds by the use of Akregator
14. KDE supports iCal by the use of KOrganizer
15. Support of feeds is available in Microsoft Office Outlook 2007. Earlier versions require RSSPopper plug-in.
16. Microsoft Outlook support of iCalendar varies by version.
17. iCalendar is supported with an extension.
18. Mozilla Thunderbird only supports SimpleMAPI.^{[citation needed]}
19. 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.

Authentication support

Client	Regular		MSN (NTLM) browser login	Compuserve (RPA)	MD5 APOP ^[Note 1]	CRAM-HMAC ^[Note 2]			DIGEST-MD5	SCRAM	with hardware token PKCS#11	Biometric	SMTP Auth ^[Note 3]	X.509 Client certificate	OAuth
	LOGIN	PLAIN				MD5	SHA1	RIPEMD
Alpine	Yes	Yes	No	No	No	Yes	No	No	No	?	No	No	Yes	No	?
Apple Mail	Yes	Yes	No	No	?	?	?	?	?	?	?	Yes	Yes	Yes	Yes ^[Note 4]
Becky! Internet Mail	Yes	Yes	Yes	?	Yes	Yes	?	?	?	?	?	?	Yes	Yes	?
Canary Mail	Yes	Yes	No	No	No	Yes	No	No	Yes	Yes	No	Yes	Yes	No	Yes
Citadel	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Claws Mail	Yes	Yes	?	?	Yes	Yes	?	?	Yes	Yes	No	?	Yes	No	Yes
Courier	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	?	No	No	Yes	Yes	?
Elm	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
eM Client	Yes	Yes	Yes	No	No	Yes	No	No	Yes	?	No	No	Yes	No	Yes
EmailTray	Yes	Yes	?	?	Yes	Yes	Yes	No	?	?	No	No	Yes	No	?
Eudora	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	?	No	No	No	?	?
Evolution	Yes	Yes	Yes	No	Yes	Yes	No	No	Yes	?	No	No	Yes	No	Yes
Gnus	Yes	Yes	?	?	Yes	Yes	Yes	?	Yes	?	?	?	Yes	?	?
GroupWise	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Hiri	Yes	Yes	Yes	No	No	No	No	No	No	?	No	No	No	No	Yes
i.Scribe / InScribe	Yes	Yes	Yes	No	Yes	No	No	No	No	?	No	No	Yes	No	Yes
IBM Lotus Notes	Yes	?	Yes	No	No	No	?	?	?	?	Yes	No	Yes	?	?
KMail	Yes	Yes	Yes	No	Yes	Yes	No	No	Yes	?	No	No	Yes	Yes	?
Mailpile	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Microsoft Entourage	Yes	No	Yes	?	?	Yes	?	?	?	?	Yes	?	Yes	Yes	?
Microsoft Office Outlook	Yes	No	Yes	No	No	No	No	No	No	?	No	No	Yes	No	?
Mozilla Mail & Newsgroups	Yes	?	?	Yes	?	Yes	?	?	?	?	?	?	?	?	?
Mozilla Thunderbird	Yes	Yes	Yes	No	Yes	Yes	No	No	No^[46]	?	Yes	No	Yes	Yes	Yes
Mulberry	Yes	Yes	Yes	No	No	Yes	No	No	Yes	?	No	No	Yes	Yes	?
Mutt	Yes	Yes	Yes	?	Yes	Yes	No	No	Yes	?	No	No	1.5.15	Yes	1.10.1
Netscape Messenger	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Netscape Messenger 9	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
nmh / MH	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Opera Mail	Yes	Yes	No	No	Yes	Yes	No	?	?	?	No	No	Yes	Yes	?
Outlook Express	Yes	No	Yes	No	No	No	No	No	No	?	No	No	Yes	No	?
Pegasus Mail	Yes	?	No	No	Yes	No	No	No	No	?	No	No	Yes	Yes	?
Pine	Yes	Yes	No	No	No	Yes	No	No	No	?	No	No	Yes	No	?
Pocomail	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
RoundCube	Yes	Yes	?	?	Yes	Yes	Yes	?	Yes	?	Yes	?	Yes	?	?
SeaMonkey Mail & Newsgroups	Yes	Yes	Yes	No	Yes	Yes	No	No	No^[46]	?	Yes	No	Yes	Yes	?
SquirrelMail	Yes	Yes	?	?	Yes	Yes	Yes	?	Yes	?	Yes	?	Yes	?	?
Sylpheed	Yes	Yes	No	No	Yes	Yes	No	No	No	?	No	No	Yes	No	No
The Bat!	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	?	Yes ^[Note 5]	Yes ^[Note 5]	Yes	No	Yes
Trojitá	Yes	No	No	No	No	No	No	No	No	?	No	No	Yes	No	?
Turnpike	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Windows Live Mail	Yes	No	Yes	No	Yes	No	No	No	No	?	No	No	No	No	No
Windows Mail	?	?	?	?	?	?	?	?	?	?	?	?	?	?	Yes ^[Note 6]
YAM	Yes	Yes	?	?	Yes	Yes	?	?	?	?	?	?	Yes	AmiSSL	?
Zimbra	Yes	Yes	?	?	Yes	Yes	?	?	?	?	Yes	?	Yes ^[Note 7]	?	?
Client	Regular		MSN (NTLM) browser login	Compuserve (RPA)	MD5 APOP ^[Note 1]	CRAM-HMAC ^[Note 2]			DIGEST-MD5	SCRAM	with hardware token PKCS#11	Biometric	SMTP Auth ^[Note 3]	SSL/TLS Client Certificate	OAUTH
	LOGIN	PLAIN				MD5	SHA1	RIPEMD

1. Description: RFC 1734
2. Description: RFC 2195
3. Description: RFC 2554
4. Minimum Mac OS version 10.11. Minimum iOS version 11.
5. Professional Edition.
6. Windows 10 required.
7. Zimbra Desktop supports SMTP auth, not sure about collaboration suite

SSL and TLS support

Client	Secure POP3		Secure IMAP4		Secure SMTP		Secure NNTP		Secure LDAP		SNI	OCSP ^[Note 1]	CRL ^[Note 2]
	SSL	TLS ^[Note 3]	SSL	TLS ^[Note 3]	SSL	TLS ^[Note 4]	SSL	TLS	SSL	TLS
Alpine	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	?	?	?
Apple Mail	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?
Becky! Internet Mail	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?
Canary Mail	No	No	Yes	Yes	Yes	Yes	No	No	No	No	No	No	No
Citadel	?	?	?	?	?	?	?	?	?	?	?	?	?
Claws Mail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	?	Yes
Courier	No	No	No	No	No	No	No	No	No	No	No	No	No
Elm	?	?	?	?	?	?	?	?	?	?	?	?	?
eM Client	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No	?	No	Yes
EmailTray	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No	?	No	No
Eudora	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	?	?	?
Evolution	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	No	No
Gnus	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?
GroupWise	?	?	?	?	?	?	?	?	?	?	?	?	?
Hiri	No	No	No	No	No	No	No	No	No	No	No	No	No
i.Scribe / InScribe	Yes	Yes	Yes	No	Yes	Yes	No	No	No	No	?	No	No
IBM Lotus Notes	Yes	Yes	Yes	?	Yes	Yes	Yes	?	Yes	?	?	Yes	Yes
KMail	Yes	Yes	Yes	Yes	Yes	Yes	No	No	?	?	?	?	?
Mailpile	?	Yes	?	Yes	?	?	?	?	?	?	?	?	?
Microsoft Entourage	Yes	?	Yes	?	Yes	?	Yes	?	Yes	?	?	?	?
Microsoft Office Outlook	Yes	No	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?
Mozilla Mail & Newsgroups	?	?	?	?	?	?	?	?	?	?	?	?	?
Mozilla Thunderbird	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes
Mulberry	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	?	?	?
Mutt	Yes	Yes	Yes	Yes	1.5.15	1.5.15	?	?	?	?	?	?	?
Netscape Messenger	?	?	?	?	?	?	?	?	?	?	?	?	?
Netscape Messenger 9	?	?	?	?	?	?	?	?	?	?	?	?	?
nmh / MH	?	?	?	?	?	?	?	?	?	?	?	?	?
Opera Mail	Yes	Partial ^[Note 5]	Yes	Partial ^[Note 5]	Yes	Partial ^[Note 5]	Yes	No	—	—	?	Yes	Yes
Outlook Express	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?
Pegasus Mail	Yes	Yes	Yes	Yes	Yes	Yes	?	?	Yes	?	?	?	?
Pine	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	?	?	?
Pocomail	?	?	?	?	?	?	?	?	?	?	?	?	?
RoundCube	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	?	?	?
SeaMonkey Mail & Newsgroups	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
SquirrelMail	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	?	?	?
Sylpheed	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?
The Bat!	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No	Yes	Yes ^[Note 6]	Yes ^[Note 6]
Trojitá	?	?	Yes	Yes	Yes	Yes	?	?	?	?	?	Yes (system)	Yes (system)
Turnpike	?	?	?	?	?	?	?	?	?	?	?	?	?
Windows Live Mail	Yes	No	Yes	No	Yes	No	?	?	?	?	?	?	?
Windows Mail	Yes	No	Yes	?	Yes	?	?	?	?	?	?	?	?
YAM	Yes	Yes	No	No	?	?	?	?	?	?	?	?	?
Zimbra	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?
Client	Secure POP3		Secure IMAP4		Secure SMTP		Secure NNTP		Secure LDAP		SNI	OCSP ^[Note 1]	CRL ^[Note 2]
	SSL	TLS ^[Note 3]	SSL	TLS ^[Note 3]	SSL	TLS ^[Note 4]	SSL	TLS	SSL	TLS

1. Online Certificate Status Protocol - Description: RFC 2560
2. Certificate revocation list - Description: RFC 3280
3. Description: RFC 2595
4. Description: RFC 2487
5. Opera Mail does not support STARTTLS command on special ports, like 995 for pop3 connection
6. 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.

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.

Client	HTML email	UTF-8 support	Image blocking	Junk filtering		Phishing filtering	Thread view	Conversation view	PGP support		S/MIME support
				local	server- side				inline	PGP/MIME or OpenPGP	protocol	OCSP	CRL	certificates on tokens, smartcards support
Alpine	Read only	Yes	Yes	?	?	?	Yes	?	Yes	?	Yes	?	?	?
Apple Mail	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	No	No	Yes	Yes	Yes	No
Becky! Internet Mail	Yes	Yes	Yes	No	No	No	Yes	No	Yes	?	Yes	?	?	?
Canary Mail	Yes	Yes	Yes	?	Yes	?	Yes	Yes	Yes	Yes	No	No	No	No
Citadel	Yes	Yes	No	Yes ^[Note 1]	?	?	No	?	?	?	?	?	?
Claws Mail	Read-only	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	?	Yes	Yes
Courier	Yes	No	No	Yes	Yes	?	No	?	?	?	?	?	?	?
Elm	?	?	?	?	?	?	?	?	?	?	?	?	?	?
eM Client	Yes	Yes	Yes	No	Yes	Yes	No	Yes	Yes	Yes	Yes	No	Yes	Yes
EmailTray	Yes	Yes	Yes	No	Yes	?	No	No	No	No	No	No	No	No
Eudora	Yes	No	Yes	Pro only	Pro only	?	Yes	No	Yes ^[Note 2]	Yes ^[Note 2]	Yes	?	?	?
Evolution	Yes	Yes	Yes	Yes	?	No	Yes	No	Yes	Yes	Yes	?	?	?
Gnus	Yes	Yes	Yes	Yes	Yes	?	Yes	?	Yes	Yes	Yes	?	?	Yes
GroupWise	Yes	Yes	Yes	Yes	?	?	Yes	?	?	?	?	?	?	?
Hiri	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	No	No	No	No	No
i.Scribe / InScribe	Read-only	Yes	Yes	Yes	No	?	Yes	?	Yes	No	No	No	No	No
HCL Notes	Yes	Yes	Yes	Yes	Yes	Yes	Yes ^[Note 3]	?	Yes	Yes (4.1.2+)	Yes	Yes^[47]	Yes	Yes
KMail	Yes	Yes	Yes	Yes	?	?	Yes	Yes	Yes (with GPG)	Yes (1.5+, with GPGME)	Yes	Yes	Yes	?
Mailbird	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	No	No	No	No	No
Mailpile	?	Yes	?	?	?	?	?	Yes	?	Yes	?	?	?	?
Microsoft Entourage	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	Yes	Yes	?	?	Yes
Microsoft Office Outlook	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes (2010+)^[48]	No	No	Yes	?	Yes	Yes
Mozilla Mail & Newsgroups	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Mozilla Thunderbird	Yes	Yes ^[Note 4]	Yes	Yes	Yes	Yes ^[Note 5]	Yes	Yes	Yes ^[Note 6]	Yes	Yes	Yes	?	Yes
Mulberry	Yes	Yes	Yes	No	Yes	?	Yes	?	Yes ^[Note 7]	Yes ^[Note 7]	Yes ^[Note 7]	?	?	?
Mutt	Read-only	Yes	Yes (no support for images)	Yes	?	?	Yes	Yes	Yes	Yes	Yes	?	Yes (with GPGME)	?
Netscape Messenger	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Netscape Messenger 9	?	?	?	?	?	?	?	?	?	?	?	?	?	?
nmh / MH	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Opera Mail	Yes	Yes	Yes	Yes	Yes	No	Yes	No	No	No	No	No	No	No
Outlook Express	Yes	Yes	Yes	No	?	?	Yes	?	Yes ^[Note 8]	No ^[Note 9]	Yes	?	?	?
Pegasus Mail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes (sending is broken)	?	No	No	No
Pine	Read-only	Yes	Yes	No	?	?	Yes	?	Yes (with Pine Privacy Guard)	No	Yes	?	?	?
Pocomail	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
RoundCube	Yes	Yes	Yes	Yes	Yes	Yes (depends on antivirus)	Yes	?	?	Yes	Yes	?	?	?
SeaMonkey Mail & Newsgroups	Yes	Yes	Yes	Yes	?	Yes	Yes	?	Yes ^[Note 6]	Yes ^[Note 6]	Yes	Yes	?	Yes
SquirrelMail	Yes	Yes	Yes	Yes	Yes	Yes (depends on antivirus)	Yes	?	?	Yes	Yes	?	?	?
Sylpheed	No ^[Note 10]	Yes	Yes	Yes	?	?	Yes	?	No	Yes	?	?	?	?
The Bat!	Yes	Yes	Yes ^[Note 11]	Yes	Yes	?	Yes	?	Yes	Yes	Yes	Partial ^[Note 12]	Partial ^[Note 12]	Yes ^[Note 12]
Trojitá	Read only	Yes	Yes	No	Yes	No	Yes	Yes	No	Read only	Read only	Read only	Read only	Read only
Turnpike	Read-only	?	?	?	?	?	?	?	?	?	?	?	?	?
Windows Live Mail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	?	?	?
Windows Mail	Yes	Yes	?	Yes	?	?	?	?	?	?	?	?	?	?
YAM	?	Yes	?	Yes	?	?	No	No	Yes	?	?	?	?	?
Zimbra	Yes	Yes	Yes	Yes	Yes	Yes (depends on antivirus)	Yes	?	?	No	?	?	?
Client	HTML email	UTF-8 support	Image blocking	Junk filtering		Phishing filtering	Thread view	Conversation view	PGP support		S/MIME support
				local	server- side				inline	PGP/MIME or OpenPGP	protocol	OCSP	CRL	certificates on tokens, smartcards support

1. Citadel plugs Mail into SpamAssassin
2. Eudora requires a plugin to handle PGP.
3. First release 6.0 (September 2003), [1] enhancements introduced in release 7.0 (August 2005)
4. 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) [2]
5. Mozilla Thunderbird adds this feature in Thunderbird 1.5.0.4
6. Using PGP in Thunderbird before version 78 requires Enigmail.
7. PGP/GPG and S/MIME support require a free (included) plugin.
8. Using PGP in Outlook Express requires a plugin.
9. Outlook Express does not display PGP/MIME signed messages.
10. 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.
11. The Bat is not able to display inline images.
12. The Bat! supports two modes of S/MIME: Internal Implementation and via Microsoft CryptoAPI.^[49] CRLs and OCSP are only supported in the latter mode. Internal implementation only supports Aladdin eToken Pro or Rainbow iKey1000^[50] 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.

Messages features

January 01, 1970

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comparison, email, clients, following, tables, compare, general, technical, features, notable, email, client, programs, contents, general, release, history, operating, system, support, protocol, support, communication, access, protocol, support, integration, p. The following tables compare general and technical features of notable email client programs Contents 1 General 2 Release history 3 Operating system support 4 Protocol support 4 1 Communication and access protocol support 4 2 Integration protocol support 4 3 Authentication support 4 4 SSL and TLS support 5 Features 5 1 General features 5 2 Messages features 5 3 Database folders and customization 5 4 Templates scripts and programming languages 6 Internationalization 7 See also 8 References 9 External linksGeneral editBasic general information about the clients creator company O S licence amp interface No longer in active development Client Author Developer Operating system Software license User Interface Alpine University of Washington Cross platform Apache 2 0 TUI Apple Mail Apple macOS iOS watchOS Proprietary GUI Cocoa Balsa Stuart Parmenter Linux GPL 2 0 or later GUI GTK3 Becky Internet Mail Rimarts Windows Proprietary GUI BlitzMail Dartmouth College BSD licenses GUI Canary Mail Cartasec Pte Ltd Cross platform Proprietary GUI Citadel citadel org Unix like GPL 3 0 only Webmail Claws Mail the Claws Mail team Cross platform GPL 3 0 or later GUI GTK2 Courier formerly Calypso Micro Computer Systems Inc continued by Rose City Software Windows Proprietary GUI Elm Dave Taylor Sydney Weinstein Bill Pemberton Michael Elkins Kari Hurtta Unix like BSD like 1 TUI eM Client eM Client Inc Windows macOS Proprietary GUI EmailTray Internet Promotion Agency S A Windows Android Proprietary GUI Eudora OSE Qualcomm Windows macOS Open source GUI Evolution The GNOME Project Unix like LGPL 2 1 only or LGPL 3 0 only GUI GTK FirstClass Open Text Proprietary GUI Forte Agent Mark Sidell Windows Proprietary GUI Geary The GNOME Project formerly Yorba Foundation Unix like LGPL 2 1 or later GUI GTK GNUMail Ludovic Marcotte and others Unix like macOS GPL 2 0 or later GUI Gnus Gnus team Cross platform GPL 3 0 or later TUI and GUI GroupWise Micro Focus formerly Novell Cross platform Proprietary GUI Hiri Hiri Cross platform Proprietary GUI i Scribe InScribe Memecode Windows macOS Linux GPL 3 0 only GUI 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 IMP Horde LLC Cross platform GPL 2 0 only Webmail K 9 Mail K 9 Dog Walkers cketti et al Android Apache 2 0 GUI KMail KDE Cross platform GNU General Public License GUI Qt Mail Windows Microsoft Windows Proprietary GUI Mailbird Mailbird Windows Proprietary GUI Mailpile Mailpile Windows macOS Linux AGPL 3 0 or later Webmail mailx Unix like BSD Licenses TUI Microsoft Entourage Microsoft macOS Proprietary GUI Microsoft Outlook Microsoft Windows macOS Proprietary GUI Mozilla Mail amp Newsgroups Mozilla Foundation Mozilla Public License GUI XUL Mozilla Thunderbird Mozilla Foundation Cross platform MPL 2 0 GUI XUL Mulberry Cyrus Daboo formerly Cyrusoft International Inc ISAMET Cross platform Apache 2 0 GUI Mutt Michael Elkins Cross platform GPL 2 0 or later TUI ncurses Netscape Messenger Netscape Communications GUI Netscape Messenger 9 Netscape Communications Mozilla Public License GUI Nylas Mail Nylas Windows macOS Linux MIT GUI nmh MH RAND Corporation Unix like BSD Licenses CLI Opera Mail Opera Software Cross platform Proprietary GUI Outlook Express Microsoft Windows Proprietary GUI Pegasus Mail David Harris Windows Proprietary GUI Pine University of Washington Cross platform Freeware 2 TUI Pocomail Poco Systems Windows Proprietary GUI RoundCube The RoundCube Team Cross platform GPL 3 0 or later Webmail Samsung Email Samsung Electronics Samsung Android 8 Proprietary GUI SeaMonkey Mail amp Newsgroups SeaMonkey Council Cross platform MPL 2 0 GUI XUL Spark Readdle macOS Proprietary GUI SquirrelMail The SquirrelMail Project Team Cross platform GPL 2 0 or later Webmail Superhuman Rahul Vohra Cross platform Proprietary Webmail Sylpheed Hiroyuki Yamamoto Cross platform Sylpheed GPL 2 0 or laterLibSylph LGPL 2 1 or later GUI GTK2 The Bat RitLabs Windows Proprietary GUI Trojita KDE Cross platform GPL 2 0 only or GPL 3 0 only Note 1 GUI Qt Turnpike Thus PLC Demon Internet Windows Proprietary GUI Vivaldi Vivaldi Technologies AS Cross platform Proprietary GUI Chrome Windows Live Mail Microsoft Windows Proprietary GUI Windows Mail Vista Microsoft Windows Proprietary GUI YAM YAM Open Source Team and contributing authors AmigaOS GPL 2 0 or later GUI Zimbra Desktop Zimbra Cross platform Mozilla Public License for server and ZPL for client GUI Client Author Developer Operating system Software license User interface 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 Release history editA brief digest of the release histories Client First public Date First public Version First stable Date First stable Version Latest stable release Alpine 2006 11 0 8 2007 December 1 00 2 26 3 nbsp 2 June 2022 Apple Mail 2001 03 24 Becky Internet Mail 1996 1 2 81 06 4 nbsp 28 February 2024 Canary Mail 15 June 2017 1 0 15 June 2017 1 0 4 01 5th June 2023 Citadel 1987 1988 1 00 996 5 nbsp 29 September 2023 Claws Mail 2001 05 0 4 67 2005 01 1 0 0 4 2 0 6 nbsp 20 November 2023 Courier 2004 06 3 5 discontinued discontinued 3 5 June 2004 Elm 1986 1987 03 2 2 5 8 7 nbsp 18 August 2005 eM Client 2007 11 1 0 2007 11 1 0 10 0 2382 0 May 10 2024 18 days ago 2024 05 10 EmailTray 2010 10 2 0 2011 03 3 11 4 0 July 2 2012 11 years ago 2012 07 02 Eudora 1988 8 1988 8 7 1 Windows 6 2 4 Mac OS October 11 2006 17 years ago 2006 10 11 Evolution 2000 05 11 0 0 2001 12 03 1 0 3 52 2 9 nbsp 24 May 2024 Forte Agent 8 October 20 2014 9 years ago 2014 10 20 Geary 2012 0 1 2012 0 1 44 1 10 nbsp 17 August 2023 Gnus 1987 11 1988 02 01 11 2 0 2015 04 06 GroupWise 1986 1 0 18 4 12 nbsp 14 March 2022 Hiri 2014 02 0 4 2016 06 1 0 1 0 11 June 10 2017 6 years ago 2017 06 10 i Scribe InScribe 1999 1 00 2 3 18 March 30 2021 3 years ago 2021 03 30 IBM Lotus Notes 1989 1 0 1989 1 0 14 0 0 13 nbsp 7 December 2023 IMP 1998 1 0 6 2 27 14 nbsp 27 August 2020 K 9 Mail 6 803 15 nbsp 10 May 2024 KMail 1998 10 Alpha 1999 02 1 0 17 5 24 3 16 nbsp 9 November 2023 Mailbird 2013 04 01 Public Beta 2 9 29 April 22 2021 3 years ago 2021 04 22 Mailpile 2011 11 17 18 19 1 0 0rc6 September 4 2019 4 years ago 2019 09 04 20 Microsoft Entourage 2008 12 3 6 March 12 2013 11 years ago 2013 03 12 Microsoft Office Outlook 1997 97 1997 97 Microsoft 365 Windows 2404 Build 17531 20152 21 May 14 2024 14 days ago 2024 05 14 Microsoft 365 Mac 16 80 Build 23121017 December 12 2023 5 months ago 2023 12 12 22 One time purchase Retail 2021 Version 2311 Build 17029 20108 23 December 12 2023 5 months ago 2023 12 12 24 One time purchase LTSC 2021 Version 2108 Build 14332 20615 December 12 2023 5 months ago 2023 12 12 23 Mozilla Thunderbird 2003 07 28 0 1 2004 12 07 1 0 115 11 0 25 nbsp 14 May 2024 Mulberry 1996 09 20 1 0 1996 09 20 1 0 4 0 8 February 21 2007 17 years ago 2007 02 21 Mutt 1995 2 2 13 26 nbsp 9 March 2024 Netscape Messenger 7 2 August 17 2007 16 years ago 2007 08 17 Netscape Messenger 9 2007 11 15 9 0a1 discontinued discontinued 2007 11 15 nmh MH 1979 1 5 June 11 2012 11 years ago 2012 06 11 Opera Mail 1996 09 2 1b1 1996 12 2 1 1 0 1044 27 February 16 2016 8 years ago 2016 02 16 Outlook Express 1996 3 0 6 0 SP3 nbsp 21 April 2008 Pegasus Mail 1990 1990 4 80 28 nbsp 14 February 2022 Pine 1992 01 15 2 00 1992 01 15 2 00 4 64 29 nbsp 28 September 2005 Pocomail 1999 4 8 build 4400 April 6 2009 15 years ago 2009 04 06 RoundCube 2006 0 1 rc1 2014 04 07 1 0 0 1 6 7 30 nbsp 19 May 2024 SeaMonkey Mail amp Newsgroups 2005 09 15 1 0a 2006 01 30 1 0 2 53 18 2 31 nbsp 28 March 2024 SquirrelMail 1999 12 0 1 2001 01 1 0 1 4 22 32 33 nbsp 12 July 2011 Sylpheed 2000 01 0 1 0 2004 12 1 0 0 3 7 34 nbsp 31 January 2018 The Bat 1997 03 1 0 Beta 1998 03 1 00 Build 1310 11 0 3 1 35 nbsp 12 January 2024 Trojita 2009 08 0 1 2012 12 0 3 90 Turnpike 1996 circa 1 0 1996 circa 1 0 6 06 May 23 2006 18 years ago 2006 05 23 Vivaldi 2015 11 03 Beta 1 2022 06 09 1 0 Windows Live Mail 2007 11 06 12 2007 11 06 12 2012 v16 4 3528 0331 November 4 2014 9 years ago 2014 11 04 Windows Mail 2007 01 01 YAM 1995 1 0 1995 1 0 2 9 36 nbsp 24 December 2013 Zimbra 2005 11 Beta 2006 03 3 5 8 6 0 37 December 15 2014 9 years ago 2014 12 15 Operating system support editThe operating systems on which the clients can run natively without emulation Client Microsoft Windows macOS Linux BSD Unix DOS Other Alpine Yes Yes Yes Yes Yes No No Apple Mail No Included No No No No No Balsa No No Yes Yes No No No Becky Internet Mail Yes No No No No No No Canary Mail Yes Yes No No No No No Citadel No Yes Yes Yes Yes No No Claws Mail Yes Yes Yes Yes Yes No No Courier Yes No No No No No No Elm No Yes Yes Yes Yes No No eM Client Yes Yes No No No No No EmailTray Yes No No No No No No Eudora Yes Yes No No No No No Evolution No Note 1 No Yes Yes Yes No No Forte Agent Yes No No No No No No Geary No No Yes Yes Yes No No Gnus Yes Yes Yes Yes Yes Yes No GroupWise Yes Yes Yes Yes No No No Hiri Yes Yes Yes No Yes No No i Scribe InScribe Yes Yes Yes No No No No IBM Lotus Notes Yes Yes Yes No Yes No No IMP Yes Yes Yes Yes Yes No No KMail No Yes Yes Yes Yes No No Mailbird Yes Yes No No No No No Mailpile Yes Note 2 Yes Note 2 Yes Yes Note 3 Yes Note 3 No Note 4 No Note 4 mailx No No Yes Yes Yes No No Microsoft Entourage No Terminated 2008 No No No No No Microsoft Office Outlook Yes Yes No No No No No Mozilla Mail amp Newsgroups Terminated 1 7 13 No No Mozilla Thunderbird Yes Yes Yes Yes Yes No No Mulberry Yes Yes Yes Yes Yes No No Mutt Yes Yes Yes Yes Yes Yes 38 No Netscape Messenger Terminated 4 80 No No Netscape Messenger 9 Terminated 9 0a1 No No nmh MH No Yes Yes Yes Yes No No Opera Mail Yes Yes Yes Yes No No Outlook Express Included up to XP No No No No No No Pegasus Mail Yes No No No No Yes NetWareNLM Pine Yes Yes Yes Yes Yes Terminated 3 96 39 No Pocomail Yes No No No No No No RoundCube Yes Yes Yes Yes Yes No No SeaMonkey Mail amp Newsgroups Yes Yes Yes Yes Yes No No SquirrelMail Yes Yes Yes Yes Yes No No Sylpheed Yes Yes Yes Yes Yes No No The Bat Yes No No No No No No Trojita Yes Yes Yes Yes Yes No MeeGo Turnpike Yes No No No No No No Vivaldi Yes Yes Yes Yes Yes No No Windows Live Mail Yes No No No No No No Windows Mail Included Vista No No No No No No YAM No No No No No No AmigaOSAROSMorphOS Zimbra Yes Yes Yes Yes Yes No No Client Microsoft Windows macOS Linux BSD Unix DOS Other Development stopped in 2008 a b Packaging planned a b Free Software project source available a b Free Software porting tangible provided OS has web browser Protocol support editCommunication and access protocol support edit What email and related protocols and standards are supported by each client Client POP3 fetch all messages RFC 1939 POP3 selected by filter RFC 1939 POP3 selected by user RFC 1939 IMAP4 RFC 3501 SMTP RFC 5321 NNTP RFC 3977 LDAP v2 RFC 4511 LDAP v3 RFC 4511 EWS IPv6 RFC 2460 MAPI Alpine Yes Yes Yes Yes Yes Yes Yes Yes Yes Apple Mail Yes Yes Yes Yes Yes Yes Yes Yes Becky Internet Mail Yes Yes Yes Yes Yes Yes Note 1 Yes Canary Mail No No No Yes Yes No No No Yes Yes No Citadel Yes Yes Yes Claws Mail Yes Yes Yes Yes Yes Yes Yes Yes Yes Courier Yes Yes Yes Yes Yes No Yes Yes Elm No No No eM Client Yes No No Yes Yes No No No Yes Yes No EmailTray Yes No No Yes Yes No No No No No No Evolution Yes No Yes Yes Yes Yes Yes Yes plug in plug in Gnus Yes Yes Yes 40 Yes Yes Yes Yes Yes No Yes Plug in 41 GroupWise Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Hiri No No No No No No Yes Yes Yes Yes No i Scribe InScribe Yes No Yes Yes Yes No Yes Note 2 Yes Note 2 No No Yes HCL Notes Yes Yes Yes Yes Yes Yes Yes Yes No Yes No KMail Yes Yes Yes Yes Yes No Note 3 Yes Mailbird Yes Yes Yes Yes Yes Yes Mailpile Yes No No Yes Yes Microsoft Entourage Yes Yes Yes Yes No Yes Partial Microsoft Entourage 2008 Web Services Edition Yes Yes Yes Yes Yes Microsoft Office Outlook Yes No No Yes Yes No Yes Yes Yes Yes Mozilla Mail amp Newsgroups Yes Yes Mozilla Thunderbird Yes No No Yes Yes Yes Partial Partial 42 extensible 43 Yes Yes Mulberry Yes No No Yes Yes No Yes Yes Yes Mutt Yes No possible with POP3 browser No possible with POP3 browser Yes Yes No slrn looks alike Partial resolve real names through NSS Yes Netscape Messenger Yes Yes Yes Netscape Messenger 9 Yes Yes Yes nmh MH Yes No Yes No No Opera Mail Yes No Yes Yes Yes Yes No No Yes Yes Outlook Express Yes No No Yes Yes Yes Yes No No Pegasus Mail Yes Yes Yes Yes Yes Yes Note 4 Yes Pine Yes No No Yes Yes Yes Yes No Pocomail Yes Yes Yes Yes Yes No No No RoundCube Yes No No Yes Yes No Yes Yes SeaMonkey Mail amp Newsgroups Yes No No Yes Yes Yes Partial Yes SquirrelMail Yes No No Yes Yes No Yes Yes Sylpheed Yes Yes Yes Yes Yes Yes Yes No No Yes No The Bat Yes Yes Note 5 Yes Note 6 Yes Yes Yes Note 7 Yes No No Yes Yes Trojita No No No Yes Yes No No No No Yes No Turnpike Yes Yes Yes Vivaldi Yes Yes Yes No Yes Windows Live Mail Yes No No Yes Yes Yes Yes No Yes No Windows Mail Yes No No Yes Yes No Yes No YAM Yes Yes Yes No Yes No No No Zimbra Yes No No Yes Yes No Yes Yes Client POP3 fetch all messages RFC 1939 POP3 selected by filter RFC 1939 POP3 selected by user RFC 1939 IMAP4 RFC 3501 SMTP RFC 5321 NNTP RFC 3977 LDAP v2 RFC 4511 LDAP v3 RFC 4511 EWS IPv6 RFC 2460 MAPI Integration protocol support edit Client IMSP 3 ACAP RFC 2244 RSS 0 91 Feeds RSS 1 0 Feeds RSS 2 0 Feeds ATOM Feeds iCalendar RFC 5545 MAPI RPC CalDAV RFC 4791 CardDAV RFC 6352 Alpine Apple Mail Yes Yes Yes Becky Internet Mail Yes Note 8 Yes Note 8 Yes Note 8 Yes Note 8 Canary Mail No No No No No No No No No No Citadel Claws Mail No Yes Note 9 Yes Note 9 Yes Note 9 Yes Note 10 Courier No No No No No No No Elm eM Client No No Yes Yes Yes No Yes No Yes Yes EmailTray No No No No No No No No Eudora No Yes No No No No No Evolution No No No Note 11 No Note 11 No Note 11 No Yes Yes Yes Yes Gnus No No Yes Yes Yes Yes 44 Yes 45 Yes Yes Yes GroupWise No Yes Hiri No No No No No No No No No No i Scribe InScribe No No No No No No No Yes IBM Lotus Notes No No Yes Note 12 Yes Yes Yes Yes KMail Yes Note 13 Yes Note 13 Yes Note 13 Yes Note 13 Yes Note 14 Yes Yes Mailpile Microsoft Entourage Yes Microsoft Office Outlook Yes Note 15 Yes Note 15 Yes Note 15 Yes Note 15 Yes Note 16 Yes No No Mozilla Mail amp Newsgroups Mozilla Thunderbird No No Yes Yes Yes Yes Yes Note 17 Yes Note 18 Yes Yes Mulberry Yes Yes No No No No Yes Yes Mutt No No No No No Netscape Messenger Netscape Messenger 9 nmh MH Opera Mail Yes Yes Yes Yes No No No Outlook Express No No No No No No No Pegasus Mail Yes Note 4 Yes Note 4 Yes Note 4 Pine No No No No No No No Pocomail No No Yes Yes Yes No No SeaMonkey Mail amp Newsgroups No No Yes Yes Yes Yes Yes Note 17 SquirrelMail Yes Yes Yes Yes Yes Yes Sylpheed No No No No No No No No The Bat No No Yes Note 19 Yes Note 19 Yes Note 19 Yes Note 19 No Yes Yes Trojita No No No No No No No No Turnpike Windows Live Mail Yes Yes Yes Yes No Windows Mail YAM No No No No No No No Zimbra Yes Yes Yes Yes Yes Client IMSP 4 ACAP RFC 2244 RSS 0 91 Feeds RSS 1 0 Feeds RSS 2 0 Feeds ATOM Feeds iCalendar RFC 5545 MAPI RPC CalDAV RFC 4791 CardDAV RFC 6352 Becky requires FRNews or BkNews plugin installed for handling NNTP a b i Scribe InScribe requires a plugin to handle LDAP KDE supports Newsgroups NNTP by the use of KNode a b c d Pegasus Mail can convert Newsgroup messages and or RSS feeds to emails through the use of free add ons 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 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 The Bat requires MyGate plugin installed for handling NNTP a b c d Becky requires BkBlogReader or BkRSSviewer or B F R or BkRssReader plugin installed for handling RSS and ATOM a b c RSSyl plugin is required to read RSS and ATOM in Claws Mail vCalendar plugin is required to handle iCalendar in Claws Mail a b c The evolution rss plugin provided as a separate package by many distributions provides the RSS functionality in Evolution Studio Blog Reader is one RSS reader application for IBM Lotus Notes IBM Lotus Notes version 8 x introduced a native RSS reader a b c d KDE supports feeds by the use of Akregator KDE supports iCal by the use of KOrganizer a b c d Support of feeds is available in Microsoft Office Outlook 2007 Earlier versions require RSSPopper plug in Microsoft Outlook support of iCalendar varies by version a b iCalendar is supported with an extension Mozilla Thunderbird only supports SimpleMAPI citation needed a b c d 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 Authentication support edit Client Regular MSN NTLM browser login Compuserve RPA MD5 APOP Note 1 CRAM HMAC Note 2 DIGEST MD5 SCRAM with hardware token PKCS 11 Biometric SMTP Auth Note 3 X 509 Client certificate OAuth LOGIN PLAIN MD5 SHA1 RIPEMD Alpine Yes Yes No No No Yes No No No No No Yes No Apple Mail Yes Yes No No Yes Yes Yes Yes Note 4 Becky Internet Mail Yes Yes Yes Yes Yes Yes Yes Canary Mail Yes Yes No No No Yes No No Yes Yes No Yes Yes No Yes Citadel Claws Mail Yes Yes Yes Yes Yes Yes No Yes No Yes Courier Yes Yes Yes No Yes Yes Yes No Yes No No Yes Yes Elm eM Client Yes Yes Yes No No Yes No No Yes No No Yes No Yes EmailTray Yes Yes Yes Yes Yes No No No Yes No Eudora Yes Yes Yes Yes Yes Yes No No No No No No Evolution Yes Yes Yes No Yes Yes No No Yes No No Yes No Yes Gnus Yes Yes Yes Yes Yes Yes Yes GroupWise Hiri Yes Yes Yes No No No No No No No No No No Yes i Scribe InScribe Yes Yes Yes No Yes No No No No No No Yes No Yes IBM Lotus Notes Yes Yes No No No Yes No Yes KMail Yes Yes Yes No Yes Yes No No Yes No No Yes Yes Mailpile Microsoft Entourage Yes No Yes Yes Yes Yes Yes Microsoft Office Outlook Yes No Yes No No No No No No No No Yes No Mozilla Mail amp Newsgroups Yes Yes Yes Mozilla Thunderbird Yes Yes Yes No Yes Yes No No No 46 Yes No Yes Yes Yes Mulberry Yes Yes Yes No No Yes No No Yes No No Yes Yes Mutt Yes Yes Yes Yes Yes No No Yes No No 1 5 15 Yes 1 10 1 Netscape Messenger Netscape Messenger 9 nmh MH Opera Mail Yes Yes No No Yes Yes No No No Yes Yes Outlook Express Yes No Yes No No No No No No No No Yes No Pegasus Mail Yes No No Yes No No No No No No Yes Yes Pine Yes Yes No No No Yes No No No No No Yes No Pocomail RoundCube Yes Yes Yes Yes Yes Yes Yes Yes SeaMonkey Mail amp Newsgroups Yes Yes Yes No Yes Yes No No No 46 Yes No Yes Yes SquirrelMail Yes Yes Yes Yes Yes Yes Yes Yes Sylpheed Yes Yes No No Yes Yes No No No No No Yes No No The Bat Yes Yes Yes Yes Yes Yes No No No Yes Note 5 Yes Note 5 Yes No Yes Trojita Yes No No No No No No No No No No Yes No Turnpike Windows Live Mail Yes No Yes No Yes No No No No No No No No No Windows Mail Yes Note 6 YAM Yes Yes Yes Yes Yes AmiSSL Zimbra Yes Yes Yes Yes Yes Yes Note 7 Client Regular MSN NTLM browser login Compuserve RPA MD5 APOP Note 1 CRAM HMAC Note 2 DIGEST MD5 SCRAM with hardware token PKCS 11 Biometric SMTP Auth Note 3 SSL TLS Client Certificate OAUTH LOGIN PLAIN MD5 SHA1 RIPEMD a b Description RFC 1734 a b Description RFC 2195 a b Description RFC 2554 Minimum Mac OS version 10 11 Minimum iOS version 11 a b Professional Edition Windows 10 required Zimbra Desktop supports SMTP auth not sure about collaboration suite SSL and TLS support edit Client Secure POP3 Secure IMAP4 Secure SMTP Secure NNTP Secure LDAP SNI OCSP Note 1 CRL Note 2 SSL TLS Note 3 SSL TLS Note 3 SSL TLS Note 4 SSL TLS SSL TLS Alpine Yes Yes Yes Yes Yes Yes Yes Yes Yes Apple Mail Yes Yes Yes Yes Yes Yes Becky Internet Mail Yes Yes Yes Yes Yes Yes Canary Mail No No Yes Yes Yes Yes No No No No No No No Citadel Claws Mail Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Courier No No No No No No No No No No No No No Elm eM Client Yes Yes Yes Yes Yes Yes No No No No No Yes EmailTray Yes Yes Yes Yes Yes Yes No No No No No No Eudora Yes Yes Yes Yes Yes Yes No No Yes Yes Evolution Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No Gnus Yes Yes Yes Yes Yes Yes Yes Yes GroupWise Hiri No No No No No No No No No No No No No i Scribe InScribe Yes Yes Yes No Yes Yes No No No No No No IBM Lotus Notes Yes Yes Yes Yes Yes Yes Yes Yes Yes KMail Yes Yes Yes Yes Yes Yes No No Mailpile Yes Yes Microsoft Entourage Yes Yes Yes Yes Yes Microsoft Office Outlook Yes No Yes Yes Yes Yes Mozilla Mail amp Newsgroups Mozilla Thunderbird Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Mulberry Yes Yes Yes Yes Yes Yes No No Yes Yes Mutt Yes Yes Yes Yes 1 5 15 1 5 15 Netscape Messenger Netscape Messenger 9 nmh MH Opera Mail Yes Partial Note 5 Yes Partial Note 5 Yes Partial Note 5 Yes No Yes Yes Outlook Express Yes Yes Yes Yes Yes Yes Pegasus Mail Yes Yes Yes Yes Yes Yes Yes Pine Yes Yes Yes Yes Yes Yes Yes Yes No No Pocomail RoundCube Yes Yes Yes Yes Yes Yes No No Yes Yes SeaMonkey Mail amp Newsgroups Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes SquirrelMail Yes Yes Yes Yes Yes Yes No No Yes Yes Sylpheed Yes Yes Yes Yes Yes Yes Yes Yes The Bat Yes Yes Yes Yes Yes Yes No No No No Yes Yes Note 6 Yes Note 6 Trojita Yes Yes Yes Yes Yes system Yes system Turnpike Windows Live Mail Yes No Yes No Yes No Windows Mail Yes No Yes Yes YAM Yes Yes No No Zimbra Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Client Secure POP3 Secure IMAP4 Secure SMTP Secure NNTP Secure LDAP SNI OCSP Note 1 CRL Note 2 SSL TLS Note 3 SSL TLS Note 3 SSL TLS Note 4 SSL TLS SSL TLS a b Online Certificate Status Protocol Description RFC 2560 a b Certificate revocation list Description RFC 3280 a b c d Description RFC 2595 a b Description RFC 2487 a b c Opera Mail does not support STARTTLS command on special ports like 995 for pop3 connection a b 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 Features editInformation on what features each of the clients support General features edit 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 Client HTML email UTF 8 support Image blocking Junk filtering Phishing filtering Thread view Conversation view PGP support S MIME support local server side inline PGP MIME or OpenPGP protocol OCSP CRL certificates on tokens smartcards support Alpine Read only Yes Yes Yes Yes Yes Apple Mail Yes Yes Yes Yes Yes Yes Yes No No Yes Yes Yes No Becky Internet Mail Yes Yes Yes No No No Yes No Yes Yes Canary Mail Yes Yes Yes Yes Yes Yes Yes Yes No No No No Citadel Yes Yes No Yes Note 1 No Claws Mail Read only Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Courier Yes No No Yes Yes No Elm eM Client Yes Yes Yes No Yes Yes No Yes Yes Yes Yes No Yes Yes EmailTray Yes Yes Yes No Yes No No No No No No No No Eudora Yes No Yes Pro only Pro only Yes No Yes Note 2 Yes Note 2 Yes Evolution Yes Yes Yes Yes No Yes No Yes Yes Yes Gnus Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes GroupWise Yes Yes Yes Yes Yes Hiri Yes Yes Yes Yes Yes Yes Yes Yes No No No No No i Scribe InScribe Read only Yes Yes Yes No Yes Yes No No No No No HCL Notes Yes Yes Yes Yes Yes Yes Yes Note 3 Yes Yes 4 1 2 Yes Yes 47 Yes Yes KMail Yes Yes Yes Yes Yes Yes Yes with GPG Yes 1 5 with GPGME Yes Yes Yes Mailbird Yes Yes Yes Yes Yes Yes Yes Yes No No No No No Mailpile Yes Yes Yes Microsoft Entourage Yes Yes Yes Yes Yes Yes Yes Yes Yes Microsoft Office Outlook Yes Yes Yes Yes Yes Yes Yes Yes 2010 48 No No Yes Yes Yes Mozilla Mail amp Newsgroups Mozilla Thunderbird Yes Yes Note 4 Yes Yes Yes Yes Note 5 Yes Yes Yes Note 6 Yes Yes Yes Yes Mulberry Yes Yes Yes No Yes Yes Yes Note 7 Yes Note 7 Yes Note 7 Mutt Read only Yes Yes no support for images Yes Yes Yes Yes Yes Yes Yes with GPGME Netscape Messenger Netscape Messenger 9 nmh MH Opera Mail Yes Yes Yes Yes Yes No Yes No No No No No No No Outlook Express Yes Yes Yes No Yes Yes Note 8 No Note 9 Yes Pegasus Mail Yes Yes Yes Yes Yes Yes Yes Yes Yes sending is broken No No No Pine Read only Yes Yes No Yes Yes with Pine Privacy Guard No Yes Pocomail Yes Yes Yes Yes Yes RoundCube Yes Yes Yes Yes Yes Yes depends on antivirus Yes Yes Yes SeaMonkey Mail amp Newsgroups Yes Yes Yes Yes Yes Yes Yes Note 6 Yes Note 6 Yes Yes Yes SquirrelMail Yes Yes Yes Yes Yes Yes depends on antivirus Yes Yes Yes Sylpheed No Note 10 Yes Yes Yes Yes No Yes The Bat Yes Yes Yes Note 11 Yes Yes Yes Yes Yes Yes Partial Note 12 Partial Note 12 Yes Note 12 Trojita Read only Yes Yes No Yes No Yes Yes No Read only Read only Read only Read only Read only Turnpike Read only Windows Live Mail Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Windows Mail Yes Yes Yes YAM Yes Yes No No Yes Zimbra Yes Yes Yes Yes Yes Yes depends on antivirus Yes No Client HTML email UTF 8 support Image blocking Junk filtering Phishing filtering Thread view Conversation view PGP support S MIME support local server side inline PGP MIME or OpenPGP protocol OCSP CRL certificates on tokens smartcards support Citadel plugs Mail into SpamAssassin a b Eudora requires a plugin to handle PGP First release 6 0 September 2003 1 enhancements introduced in release 7 0 August 2005 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 2 Mozilla Thunderbird adds this feature in Thunderbird 1 5 0 4 a b c Using PGP in Thunderbird before version 78 requires Enigmail a b c PGP GPG and S MIME support require a free included plugin Using PGP in Outlook Express requires a plugin Outlook Express does not display PGP MIME signed messages 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 The Bat is not able to display inline images a b c The Bat supports two modes of S MIME Internal Implementation and via Microsoft CryptoAPI 49 CRLs and OCSP are only supported in the latter mode Internal implementation only supports Aladdin eToken Pro or Rainbow iKey1000 50 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 Messages features edit Client Label messages Reformat received messages Bi directional text support Composing messages Native images preview Postpone scheduled message sending Native documents preview with colors with flag antidelete add note edit headers e g Subject forced recode Note 1 Spell checking Signatures Bottom posts replies jpeg gif bmp png others txt pdf doc xls odt ods others Alpine Yes Yes Yes Yes Yes Yes Becky Internet Mail Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Canary Mail No No No No Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes No Yes Citadel td, wikipedia, wiki, book, books, library,

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Client	Label messages				Reformat received messages		Bi-directional text support	Composing messages			Native images preview					Postpone / scheduled message sending	Native documents preview
	with colors	with flag	antidelete	add note	edit headers (e.g., Subject)	forced recode ^[Note 1]		Spell checking	Signatures	Bottom-posts replies	jpeg	gif	bmp	png	others		txt	pdf	doc	xls	odt	ods	others
Alpine	Yes	Yes	?	?	?	?	?	Yes	Yes	?	?	?	?	?	?	Yes	Yes	?	?	?	?	?	?
Becky! Internet Mail	Yes	Yes	?	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
Canary Mail	?	?	No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	No	Yes
Citadel	?	?	?	?	?	?	?	?	?	?	?	?	?