Comparison of email clients

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

General[edit]

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

^ 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[edit]

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

?

2.81.05^[4]

30 November 2023

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

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

9.2.2157.0 (October 10, 2023; 6 months ago) [±]

EmailTray

2010-10

2.0

2011-03

3.11

4.0 (July 2, 2012; 11 years ago) [±]

Eudora

1988^[8]

?

1988^[8]

?

7.1 (Windows), 6.2.4 (Mac OS) (October 11, 2006; 17 years ago) [±]

Evolution

2000-05-11

0.0

2001-12-03

1.0

3.52.1^[9]

19 April 2024

Forté Agent

?

8 (October 20, 2014; 9 years ago) [±]

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) [±]

i.Scribe / InScribe

1999

1.00

?

2.3.18 (March 30, 2021; 3 years ago) [±]

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

?

6.802^[15]

5 April 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) [±]

Mailpile

2011-11

^[17]

^[18]

^[19]

1.0.0rc6 (September 4, 2019; 4 years ago^[20]) [±]

Microsoft Entourage

?

2008 (12.3.6) (March 12, 2013; 11 years ago) [±]

Microsoft Office Outlook

1997

97

1997

97

Microsoft 365 (Windows)	2312 (Build 17126.20132)^[21] / January 9, 2024; 3 months ago (2024-01-09)
Microsoft 365 (Mac)	16.80 (Build 23121017) / December 12, 2023; 4 months ago (2023-12-12)^[22]
One-time purchase (Retail)	2021 Version 2311 (Build 17029.20108)^[23] / December 12, 2023; 4 months ago (2023-12-12)^[24]
One-time purchase (LTSC)	2021 Version 2108 (Build 14332.20615) / December 12, 2023; 4 months ago (2023-12-12)^[23]

Mozilla Thunderbird

2003-07-28

0.1

2004-12-07

1.0

115.10.1^[25]

18 April 2024

Mulberry

1996-09-20

1.0

1996-09-20

1.0

4.0.8 (February 21, 2007; 17 years ago) [±]

Mutt

1995

?

2.2.13^[26]

9 March 2024

Netscape Messenger

?

7.2 (August 17, 2007; 16 years ago) [±]

Netscape Messenger 9

2007-11-15

9.0a1

discontinued

2007-11-15

nmh / MH

1979

?

1.5 (June 11, 2012; 11 years ago) [±]

Opera Mail

1996-09

2.1b1

1996-12

2.1

1.0.1044^[27] (February 16, 2016; 8 years ago) [±]

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) [±]

RoundCube

2006

0.1-rc1

2014-04-07

1.0.0

1.6.6^[30]

20 January 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; 17 years ago) [±]

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) [±]

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) [±]

Operating system support[edit]

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	Yes	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

^ 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[edit]

Communication 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 & 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[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 & 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)

^ 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
Client	LOGIN	PLAIN	MSN (NTLM) browser login	Compuserve (RPA)	MD5 APOP ^{[Note 1]}	MD5	SHA1	RIPEMD	DIGEST-MD5	SCRAM	with hardware token PKCS#11	Biometric	SMTP Auth ^{[Note 3]}	X.509 Client certificate	OAuth
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
Client	LOGIN	PLAIN	MSN (NTLM) browser login	Compuserve (RPA)	MD5 APOP ^{[Note 1]}	MD5	SHA1	RIPEMD	DIGEST-MD5	SCRAM	with hardware token PKCS#11	Biometric	SMTP Auth ^{[Note 3]}	SSL/TLS Client Certificate	OAUTH

^ ^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]}
Client	SSL	TLS ^{[Note 3]}	SSL	TLS ^{[Note 3]}	SSL	TLS ^{[Note 4]}	SSL	TLS	SSL	TLS	SNI	OCSP ^{[Note 1]}	CRL ^{[Note 2]}
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]}
Client	SSL	TLS ^{[Note 3]}	SSL	TLS ^{[Note 3]}	SSL	TLS ^{[Note 4]}	SSL	TLS	SSL	TLS	SNI	OCSP ^{[Note 1]}	CRL ^{[Note 2]}

^ ^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[edit]

Information 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
Client	HTML email	UTF-8 support	Image blocking	local	server- side	Phishing filtering	Thread view	Conversation view	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
Client	HTML email	UTF-8 support	Image blocking	local	server- side	Phishing filtering	Thread view	Conversation view	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
Client	with colors	with flag	antidelete	add note	edit headers (e.g., Subject)	forced recode ^{[Note 1]}	Bi-directional text support	Spell checking	Signatures	Bottom-posts replies	jpeg	gif	bmp	png	others	Postpone / scheduled message sending	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	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Claws Mail	Copyright 2020 WikiZero EN TR JP RU DE €4.95 / month Favourites List Audio Listining Color Mode Monthly New Updates Fullname * Email * Credit or debit card A PHP Error was encountered Severity: Notice Message: Undefined variable: userid Filename: user/popup_modal.php Line Number: 68 Backtrace: File: /home/ah0ejbmyowku/public_html/application/views/user/popup_modal.php Line: 68 Function: _error_handler File: /home/ah0ejbmyowku/public_html/application/views/page/index.php Line: 478 Function: view File: /home/ah0ejbmyowku/public_html/application/controllers/Main.php Line: 107 Function: view File: /home/ah0ejbmyowku/public_html/index.php Line: 315 Function: require_once "> Premium Membership €4.95 ~~€ 9.90~~ / month Create a Premium Account quick and easy Save your Favourite Pages Listen to any page in Audio Colour Night Mode Create your Account Cancel Subscription Comparison_of_email_clients" id="cancelSubscription" name="cancelSubscription" class="mb-0"> Are you sure you want to cancel your membership with us? A PHP Error was encountered Severity: Notice Message: Undefined variable: user_membership Filename: user/popup_modal.php Line Number: 192 Backtrace: File: /home/ah0ejbmyowku/public_html/application/views/user/popup_modal.php Line: 192 Function: _error_handler File: /home/ah0ejbmyowku/public_html/application/views/page/index.php Line: 478 Function: view File: /home/ah0ejbmyowku/public_html/application/controllers/Main.php Line: 107 Function: view File: /home/ah0ejbmyowku/public_html/index.php Line: 315 Function: require_once A PHP Error was encountered Severity: Warning Message: Invalid argument supplied for foreach() Filename: user/popup_modal.php Line Number: 192 Backtrace: File: /home/ah0ejbmyowku/public_html/application/views/user/popup_modal.php Line: 192 Function: _error_handler File: /home/ah0ejbmyowku/public_html/application/views/page/index.php Line: 478 Function: view File: /home/ah0ejbmyowku/public_html/application/controllers/Main.php Line: 107 Function: view File: /home/ah0ejbmyowku/public_html/index.php Line: 315 Function: require_once A PHP Error was encountered Severity: Notice Message: Undefined variable: userid Filename: user/popup_modal.php Line Number: 208 Backtrace: File: /home/ah0ejbmyowku/public_html/application/views/user/popup_modal.php Line: 208 Function: _error_handler File: /home/ah0ejbmyowku/public_html/application/views/page/index.php Line: 478 Function: view File: /home/ah0ejbmyowku/public_html/application/controllers/Main.php Line: 107 Function: view File: /home/ah0ejbmyowku/public_html/index.php Line: 315 Function: require_once "> Harry Potter Books A PHP Error was encountered Severity: Notice Message: Undefined variable: products Filename: user/popup_harry_book.php Line Number: 24 Backtrace: File: /home/ah0ejbmyowku/public_html/application/views/user/popup_harry_book.php Line: 24 Function: _error_handler File: /home/ah0ejbmyowku/public_html/application/views/page/index.php Line: 479 Function: view File: /home/ah0ejbmyowku/public_html/application/controllers/Main.php Line: 107 Function: view File: /home/ah0ejbmyowku/public_html/index.php Line: 315 Function: require_once A PHP Error was encountered Severity: Warning Message: Invalid argument supplied for foreach() Filename: user/popup_harry_book.php Line Number: 24 Backtrace: File: /home/ah0ejbmyowku/public_html/application/views/user/popup_harry_book.php Line: 24 Function: _error_handler File: /home/ah0ejbmyowku/public_html/application/views/page/index.php Line: 479 Function: view File: /home/ah0ejbmyowku/public_html/application/controllers/Main.php Line: 107 Function: view File: /home/ah0ejbmyowku/public_html/index.php Line: 315 Function: require_once

[LicenseRef-KDE-Accepted-GPL-3] 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."

[Evolution_nowin-40] Development stopped in 2008

[Mailpile_soon-41] Packaging planned

[Mailpile_foss-42] Free Software project, source available.

[Mailpile_port-43] Free Software porting tangible provided OS has web browser.

[BECKY_frnews-50] Becky! requires FRNews or BkNews plugin installed for handling NNTP.

[plugin-53] .Scribe / InScribe requires a plugin to handle LDAP.

[KDENNTP-54] KDE supports Newsgroups (NNTP) by the use of KNode

[pegasusaddins-57] Pegasus Mail can convert Newsgroup messages and/or RSS feeds to emails through the use of free add-ons.

[SelectiveDownload-58] 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.

[MessageDispatcher-59] 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.

[BAT_mygate-60] The Bat! requires MyGate plugin installed for handling NNTP.

[BECKY_rss-61] Becky! requires BkBlogReader or BkRSSviewer or B.F.R or BkRssReader plugin installed for handling RSS and ATOM.

[Claws-62] RSSyl plugin is required to read RSS and ATOM in Claws Mail.

[Claws2-63] vCalendar plugin is required to handle iCalendar in Claws Mail.

[Evolution-rss-64] The evolution-rss plugin (provided as a separate package by many distributions provides the RSS functionality in Evolution.

[NotesRSS-67] Studio Blog Reader is one RSS reader application for IBM Lotus Notes. IBM Lotus Notes version 8.x introduced a native RSS reader.

[KDEFeeds-68] KDE supports feeds by the use of Akregator

[KDEiCal-69] KDE supports iCal by the use of KOrganizer

[OutlookFeeds-70] Support of feeds is available in Microsoft Office Outlook 2007. Earlier versions require RSSPopper plug-in.

[OutlookiCal-71] Microsoft Outlook support of iCalendar varies by version.

[MTB-72] Calendar is supported with an extension.

[SimpleMAPI-73] Mozilla Thunderbird only supports SimpleMAPI.^{[citation needed]}

[BAT_rss2pop3-74] 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.

[APOP-94] Description: RFC 1734

[HMAC-95] Description: RFC 2195

[SMTPAUTH-96] Description: RFC 2554

[AppleMailOAuth-97] Minimum Mac OS version 10.11. Minimum iOS version 11.

[TheBat-99] Professional Edition.

[WindowsMailOAuth-100] Windows 10 required.

[Zimbra-101] Zimbra Desktop supports SMTP auth, not sure about collaboration suite

[OCSP-109] Online Certificate Status Protocol - Description: RFC 2560

[CRL-110] Certificate revocation list - Description: RFC 3280

[IMAPPOP-111] Description: RFC 2595

[SMTPTLS-112] Description: RFC 2487

[M2STLS-113] Opera Mail does not support STARTTLS command on special ports, like 995 for pop3 connection

[TBCSP-114] 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.

[CITADELspam-121] Citadel plugs Mail into SpamAssassin

[EUDORAPGP-122] Eudora requires a plugin to handle PGP.

[NotesThread-123] First release 6.0 (September 2003), [1] enhancements introduced in release 7.0 (August 2005)

[MTBUTF8-126] 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]

[MTB15-127] Mozilla Thunderbird adds this feature in Thunderbird 1.5.0.4

[MTBPGP-128] Using PGP in Thunderbird before version 78 requires Enigmail.

[MulberryEncryption-129] PGP/GPG and S/MIME support require a free (included) plugin.

[OEPGP-130] Using PGP in Outlook Express requires a plugin.

[OEPGPMIME-131] Outlook Express does not display PGP/MIME signed messages.

[SYLHTML-132] 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.

[TBIMAGE-133] The Bat is not able to display inline images.

[TBCRL-134] 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.

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Comparison of email clients

General[edit]

Release history[edit]

Operating system support[edit]

Protocol support[edit]

Communication and access protocol support[edit]

Integration protocol support[edit]

Authentication support[edit]

SSL and TLS support[edit]

Features[edit]

General features[edit]

Messages features[edit]

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