Comparison_of_email_clients

Comparison of email clients

Add article description

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

Release history

A brief digest of the release histories.

More information Client, First public Date ...

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) [±]

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) [±]

Protocol support

Authentication support

More information Client, Regular ...

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

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

SSL and TLS support

More information Client, Secure POP3 ...

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]}

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

More information Client, HTML email ...

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

[N 1]
Citadel plugs Mail into SpamAssassin
[N 2]
Eudora requires a plugin to handle PGP.
[N 3]
First release 6.0 (September 2003), enhancements introduced in release 7.0 (August 2005)
[N 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)
[N 5]
Mozilla Thunderbird adds this feature in Thunderbird 1.5.0.4
[N 6]
Using PGP in Thunderbird before version 78 requires Enigmail.
[N 7]
PGP/GPG and S/MIME support require a free (included) plugin.
[N 8]
Using PGP in Outlook Express requires a plugin.
[N 9]
Outlook Express does not display PGP/MIME signed messages.
[N 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.
[N 11]
The Bat is not able to display inline images.
[N 12]
The Bat! supports two modes of S/MIME: Internal Implementation and via Microsoft CryptoAPI.^{[Note 13]} CRLs and OCSP are only supported in the latter mode. Internal implementation only supports Aladdin eToken Pro or Rainbow iKey1000^{[Note 14]} 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.
[N 13]
"List of features of The Bat! email client".
[N 14]
"The Bat! with Hardware Tokens".

Messages features

More information Client, Label messages ...

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	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	with a plugin	?	?	?	?	?
Courier	Yes	Yes	No	No	Yes	?	?	Yes	Yes	?	No	No	No	No	No	Yes	?	No	No	No	No	No	?
Elm	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
eM Client	Yes	Yes	No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?
EmailTray	Yes	No	No	No	No	No	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	No	Yes	Yes	Yes	Yes	No	No	?
Eudora	Yes	Yes	No	No	Yes	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	QuickTime	Yes	?	?	?	?	?	?	?
Evolution	Yes	Yes	?	?	No	?	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
Gnus	Yes	Yes	Yes	?	?	?	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	XPM	Yes	?	?	?	?	?	?	?
GroupWise	Yes	Yes	Yes	Yes	Yes	?	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?
Hiri	Yes	Yes	No	Yes	No	No	No	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No	No	No	No	No
i.Scribe / InScribe	Yes	No	No	Yes	No	No	No	Yes ^{[Note 2]}	Yes	Yes	Yes ^{[Note 3]}	Yes	Yes	Yes ^{[Note 4]}	ICO, TIFF	Yes	No	No	No	No	No	No	No
HCL Notes	Yes	Yes	?	?	Yes	?	?	Yes	Yes	?	Yes	Yes	Yes	No	CGM, Lotus PIC, PCX, TIFF	?	Yes	Yes	Yes	Yes	?	?	?
KMail	Yes^[49]	Yes	No	Yes	?	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
Mailbird	Yes	Yes	?	Yes	?	?	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	No	No	?
Mailpile	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Microsoft Entourage	Yes	Yes	?	Yes^{[Note 5]}	?	?	?	Yes	Yes	?	Yes	Yes	?	Yes	?	?	?	Yes	?	?	?	?	?
Microsoft Office Outlook	Yes	Yes	No	Yes	Yes	?	?	Yes	Yes	No	Yes	Yes	Yes	Yes	?	Yes	Yes	with a plugin	Yes	Yes	2010	2010	PowerPoint
Mozilla Mail & Newsgroups	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Mozilla Thunderbird	Yes	Yes	?	?	with a plugin^[50]	?	?	Yes	Yes	Yes ^{[Note 6]}	Yes	Yes	Yes	Yes	ICO	Yes ^{[Note 7]}	Yes	Yes	No	No	No	No	No
Mulberry	?	Yes	?	?	?	?	?	Yes	Yes	?	No	No	No	No	No	?	?	?	?	?	?	?	?
Mutt	Yes	Yes	No	No	Yes	?	?	Yes	Yes	?	No	No	No	No	No	postpone	?	?	?	?	?	?	?
Netscape Messenger	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Netscape Messenger 9	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
nmh / MH	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Opera Mail	Yes	Yes	No	No	?	?	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	APNG, ICO, SVG, WBMP, XBM, WebP	No	No	No	No	No	No	No	No
Outlook Express	No	Yes	No	No	?	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	ICO, art	?	?	?	?	?	?	?	?
Pegasus Mail	Yes	Yes	Yes	Yes	in index	No	No	Yes	Yes	No ^{[Note 8]}	Yes	Yes	Yes	Yes	TIFF	—	Yes	No	No	No	No	No	RTF, HTML
Pine	Yes	Yes	?	?	No	with a patch ^{[Note 9]}	?	Yes ^{[Note 10]}	Yes	?	No	No	No	No	No	?	?	?	?	?	?	?	?
Pocomail	Yes	Yes	?	Yes	?	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
RoundCube	Yes	Yes	Yes	Yes	?	?	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	Yes	Yes	Yes	Yes	Yes	Yes	?
SeaMonkey Mail & Newsgroups	Yes	Yes	No	No	?	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
SquirrelMail	Yes	Yes	Yes	Yes	?	?	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	Yes	Yes	Yes	Yes	Yes	Yes	?
Sylpheed	Yes	Yes	No	No	?	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	Yes	No	No	No	No	No	?
The Bat!	Yes	Yes	Yes	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	ICO, emf	Yes	Yes	No	No	No	No	No	No
Trojitá	No	Yes	?	?	No	No	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No	No	Yes
Turnpike	Yes	?	?	No	?	?	?	Yes	Yes	?	Yes	Yes	Yes	No	?	?	?	?	?	?	?	?	?
Windows Live Mail	No	Yes	No	No	?	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
Windows Mail	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
YAM	No	No	No	No	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Zimbra	Yes	Yes	Yes	Yes	?	?	?	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?
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

[N 1]
It's a frequent problem for people dealing with Cyrillic/Russian in email messages that the message is not encoded in the encoding declared in its headers and thus can't be read. With such a message (with a wrong declaration of the encoding), it well might be the case that it passed through several incorrect recoding stages while it was being sent and delivered; thus it's not possible to correctly render it and read it if one uses the common type of the interface for choosing the encoding (such as the menu in Mozilla Firefox). An example of such a complex case of a wrongly declared encoding: a message was entered through a webform in the windows-1251 encoding, but the web interface incorrectly assumed that it was in latin-1; based on this assumption, it performed the recoding from latin-1 to utf-8. The result of this operation cannot be correctly decoded through the common encoding-selection interface; it can only be decoded through a two-stage recoding: first from utf-8 to latin-1, then from windows-1251 to utf-8 (assuming that one works in a Unicode environment). After it is decoded, it is desirable to store it in the recoded form instead of the original, in order to be able to read it easily afterwards, and to quote it for replies.
[N 2]
i.Scribe / InScribe supports full integration with GNU Aspell, which is its requirement for spell checking.
[N 3]
i.Scribe / InScribe requires libjpeg.
[N 4]
i.Scribe / InScribe requires libpng.
[N 5]
Entourage can link a message to a note.
[N 6]
Configurable to start replies at top or bottom, with separate configuration of signature position
[N 7]
Thunderbird requires SL8TR extension.
[N 8]
Starts replies with cursor at top, but is configurable regarding whether to include a blank space at the top for replies or not; some interleaved-posting users prefer starting the cursor at the top so they can trim the quotes
[N 9]
The recoding engine and interface extensions that would solve the described recoding problems have been developed as a patch for Pine; it is to be found in the package pine-4.58L-alt4.src.rpm(ftp) for ALTLinux (under the name pine-4.58L-alt2-0.4.1.diff). Its essential feature is to enable to forcibly recode messages, save them in the recoded form, and quote in replies.
[N 10]
Pine supports full integration with GNU Aspell or other external speller, which is its requirement for spell checking.

Database, folders and customization

More information Client, Message file format ...

Client	Message file format	Encrypted database	Virtual folders	Scheduled backup	New mail notification				Customizable interface	Customizable keybindings	Fragmented messages ^{[Note 1]}	Database search with regular expressions support	Indexed search	Search folders ^{[Note 2]}	IMAP
Client	Message file format	Encrypted database	Virtual folders	Scheduled backup	ticker	tray icon	tooltip	sound	Customizable interface	Customizable keybindings	Fragmented messages ^{[Note 1]}	Database search with regular expressions support	Indexed search	Search folders ^{[Note 2]}	Search	IDLE
Alpine	mbox, mbx, MIX, maildir (with patches), MMDF, tenex, mtx, MH, mx, news, phile	?	Yes	Partial	?	?	?	Yes	Yes	No	?	No	Yes	Yes	Yes	No
Becky! Internet Mail	mbox	?	?	No	Yes	?	Yes	Yes	?	?	?	Yes	?	Yes	Yes	Yes
Canary Mail	Proprietary	Yes	No	No	?	Yes	?	Yes	Yes	Yes	No	No	Yes	Yes	Yes	Yes
Citadel	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Claws Mail	MH, mbox (plugin)	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	No	Yes	No
Courier	Proprietary	Yes (weak)	Yes	?	?	?	?	?	Yes (layout)	No	?	No	No	Yes	No	Yes
Elm	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
eM Client	Proprietary (sqlite)	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	No	No	Yes	Yes	No	Yes
EmailTray	Proprietary	Yes	Yes	No	Yes	Yes	No	Yes	No	No	No	No	Yes	Yes	?	?
Eudora	modified mbox	No	Yes	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes ^[specify]	Yes	Yes	Yes	?
Evolution	maildir, mbox, MH	No	Yes	No	No	Yes	Yes	Yes	Partial	Yes ^{[Note 3]}	Yes	Yes	Yes	Yes	Yes	Yes
Gnus	babyl, maildir, mbox, MMDF, news, rnews, SOUP, outlook, oe-dbx	No	Yes	No	No	?	?	?	Yes	Yes	Yes	Yes	Yes^{[Note 4]}	Yes	Yes	?
GroupWise	Proprietary	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	?	?	?	Yes	Yes	Yes	No
Hiri	Proprietary	No	No	No	No	No	No	No	Yes	No	No	No	Yes	Yes	No	No
IBM Notes	Proprietary	Yes^[52]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes ^{[Note 5]}	No	Yes	Yes	?	No
KMail	mbox, maildir	No	Yes	No	?	?	?	?	Yes	Yes	No	Yes	?	Yes	Yes	Yes
Mailbird	Proprietary	No	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Partial	Yes	Yes	Yes
Mailpile	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Microsoft Entourage	Proprietary (Personal Storage Table)	?	Yes	Partial ^{[Note 6]}	?	?	?	?	Partial	No	No	Partial ^{[Note 7]}	Yes	Yes	Yes	Yes
Microsoft Office Outlook	Proprietary (Personal Storage Table)	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	?	?	Yes ^{[Note 8]}	Yes	?	Yes
Mozilla Mail & Newsgroups	mbox	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Mozilla Thunderbird	mbox, maildir	No	Yes	?	?	Yes	Yes	Yes	Yes ^{[Note 9]}	?	No	?	Yes (as of 3.0)	Yes	Yes	Yes
Mulberry	mbox ^{[Note 10]}	Partial ^{[Note 11]}	Partial ^{[Note 11]}	Partial ^{[Note 11]}	?	?	?	?	Yes	?	?	Yes ^[specify]	Partial ^{[Note 11]}	No	Yes	No
Mutt	mbox, MMDF, MH, maildir	Yes (with compressed folders patch^[53])	? (has limit command)	No	?	?	?	?	Yes	Yes	?	Yes	Yes^{[Note 12]}	Yes^{[Note 12]}	Yes	Yes
Netscape Messenger	mbox	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Netscape Messenger 9	mbox	?	?	?	?	?	?	?	?	?	?	?	?	?	?	?
nmh / MH	MH	No	Yes	No	No	?	?	?	Yes	Yes	?	Yes	Yes	Yes	No	?
Opera Mail	mbox, MH, Proprietary	No	Yes (all folders are virtual)	No	No	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	?	Yes
Outlook Express	Proprietary	No	No	No	?	Yes	No	Yes	No	No	Yes	?	No	?	?	Yes
Pegasus Mail	Proprietary (mbox-like)	No	Yes	No	?	Yes	Yes	Yes	Yes	?	?	Yes	?	Yes	Yes	No^[56]
Pine	mbox, mbx, MIX, maildir (with patches), MMDF, tenex, mtx, MH, mx, news, phile	?	?	?	?	?	?	?	?	?	?	?	?	?	?	No
Pocomail	mbox	Yes	Yes	Yes	?	?	?	?	Yes	?	?	Yes	Yes	Yes	?	?
RoundCube	[IMAP Server]	?	?	?	Yes	No	No	Yes	Yes	Yes	?	?	?	Yes	Yes	?
i.Scribe / InScribe	Proprietary (sqlite)	No	No	No	No	Yes	No	Yes	Yes	No	No	No	No	No	No	Yes
SeaMonkey Mail & Newsgroups	mbox	?	?	?	Yes	Yes	Yes	Yes	?	?	?	?	?	?	Yes	Yes
SquirrelMail	[IMAP Server]	?	?	?	Yes	No	No	Yes	Yes	Yes	?	?	?	Yes	Yes	?
Sylpheed	MH	No	Yes	No	?	Yes	?	?	Yes	Yes	No	No ^{[Note 13]}	No ^{[Note 13]}	Yes	?	No
The Bat!	Proprietary	Yes (AES 128 bit) (with Pro and Voyager version) ^{[Note 14]}	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes (PCRE 6.2)	No	Yes	Yes	Yes
Trojitá	IMAP	No	No	No	No	Yes	No	No	Yes	Yes	No	No	Yes	No	Yes	Yes
Turnpike	Proprietary	Yes	Yes	?	?	?	?	?	?	?	Yes	?	?	Yes	?	?
Windows Live Mail	File System (.eml)	No	No	No	No	Yes	?	Yes	Yes	No	Yes	No	Yes	Yes	?	?
Windows Mail	?	?	?	?	?	?	?	Yes	?	?	?	?	?	?	?	Yes
YAM	mbox, maildir, oe-dbx	No	No	No	?	?	Yes	Yes	Yes	No	No	No	No	No	No	No
Zimbra	File system	No	Yes	Yes	?	?	?	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Client	Message file format	Encrypted database	Virtual folders	Scheduled backup	New mail notification				Customizable interface	Customizable keybindings	Fragmented messages ^{[Note 1]}	Database search with regular expressions support	Indexed search	Search folders ^{[Note 2]}	IMAP
Client	Message file format	Encrypted database	Virtual folders	Scheduled backup	ticker	tray icon	tooltip	sound	Customizable interface	Customizable keybindings	Fragmented messages ^{[Note 1]}	Database search with regular expressions support	Indexed search	Search folders ^{[Note 2]}	Search	IDLE

[N 1]
Fragmented messages make it possible, for example, to send a large audio message as several partial messages, and still have it appear to the recipient as a simple audio message rather than as an encapsulated message containing an audio message. RFC 2046
[N 2]
Search Folders are virtual folders that contain views of all email items matching specific search criteria. Search Folders display the results of previously defined search queries.
[N 3]
Editable keybindings is part of GNOME, provided "Editable menu accelerators" is enabled in GNOME's "Menus & Toolbars" control applet.
[N 4]
Via nnir backends such as Notmuch^[51]
[N 5]
Fragmented messages are called truncated document in Lotus Notes.
[N 6]
With Entourage 2008, you can use AppleScript and various internal/external scheduling mechanisms to create timed backups of Entourage Data.
[N 7]
With Entourage 2008 and later versions of 2004, you can use the Spotlight data to search what's in the Entourage database via regular expression in the file system in Terminal or via Spotlight's ...interesting...version of "regular expressions".
[N 8]
supported since Office 2007.
[N 9]
Thunderbird's interface can be user customized via the use of themes (which can reposition and skin controls)
[N 10]
This is for Mulberry's 'offline browsing' capability, which is turned off by default. In the default configuration no local copy of the mail is created.
[N 11]
Mulberry is a dedicated IMAP client; If the IMAP server has these abilities, Mulberry can use them.
[N 12]
Via Notmuch or other indexers.^[54]^[55]
[N 13]
Because MH stores each letter in a separate file, it is trivially easy to (externally) search them with grep. This ease is shattered when non-raw encodings are used, such as base64.
[N 14]
The Bat! Pro support two methods access to program when database is encrypted: password authorization and token authorization; Voyager support only password authorization and encrypted database is default and only available storage method.

Templates, scripts and programming languages

More information Client, Message templates ...

Client	Message templates						Message templates individual for	Support in message templates scripts, programming languages
Client	new	reply	forward	read confirmation	save	print	Message templates individual for	JavaScript	VBScript	PHP Scripts	Python	Regular expressions	Java	Other (specify)
Alpine	Yes	Yes	Yes	?	?	?	any	No	No	No	No	?	No	?
Becky! Internet Mail	Yes	Yes	Yes	Yes	Yes	Yes	any account folder	?	?	?	?	?	?
Canary Mail	Yes	Yes	Yes	Yes	Yes	Yes	?	No	No	No	No	No	No	*
Citadel	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Claws Mail	Yes	Yes	Yes	Yes	Yes	Yes	account folder	No	No	No	Yes	?	?	Perl
Courier	Yes	Yes	Yes	No	Yes	Yes	?	No	No	No	No	No	No	No
Elm	?	?	?	?	?	?	?	?	?	?	?	?	?	?
eM Client	Yes	Yes	Yes	Yes	Yes	Yes	account	No	No	No	No	No	No	No
Eudora	Yes	Yes	Yes	Yes	Yes	Yes	any	No	No	No	No	Yes	No	No
Evolution	Yes	Yes	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?
Gnus	Yes	Yes	Yes	Yes	Yes	Yes	?	No	No	No	No	Yes	No	elisp
GroupWise	Yes	No	No	Yes	Yes	?	?	?	?	?	?	?	?	?
Hiri	Yes	Yes	Yes	No	Yes	Yes	any	No	No	No	No	No	No	No
i.Scribe / InScribe	Yes	Yes	Yes	No	No	No	any	No	No	No	No	No	No	Internal macros (similar to JavaScript)
IBM Notes	Yes	Yes	Yes	Yes	?	?	?	Yes	No	No	No	Yes^[57]	Yes	LotusScript, Formula language
KMail	Yes	Yes	Yes	No	No	No	none	?	No	No	No	?	?	?
Mailpile	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Microsoft Entourage	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?	AppleScript, Automator
Microsoft Office Outlook	Yes	Yes	Yes	Yes	?	?	?	No	No	?	No	?	No	?
Mozilla Mail & Newsgroups	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Mozilla Thunderbird	Yes	Yes^{[Note 1]}	Yes^{[Note 1]}	Yes	Yes	Yes	profile	Yes	?	?	?	?	?	?
Mulberry	Yes	Yes	Yes	Yes	?	?	?	No	No	No	No	?	?	?
Mutt	Yes	Yes	Yes	No	?	?	any	No	No	No	No	Yes	?	Internal macros
Netscape Messenger	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Netscape Messenger 9	?	?	?	?	?	?	?	?	?	?	?	?	?	?
nmh / MH	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Opera Mail	No	No	No	No	No	No	—	No	No	No	No	No	No	No
Outlook Express	Yes	Yes	?	Yes	?	?	?	Yes	Yes	?	?	?	?	?
Pegasus Mail	Yes	Yes	Yes	Yes	?	?	?	?	?	?	?	?	?	?
Pine	Yes	Yes	Yes	?	?	?	any	?	No	No	?	?	No	?
Pocomail	Yes	Yes	Yes	?	?	Yes	?	No	No	No	No	No	No	PocoScript
RoundCube	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No	No	No	?
SeaMonkey Mail & Newsgroups	?	?	?	?	?	?	?	?	?	?	?	?	?	?
SquirrelMail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	No	No	No	No	?
Sylpheed	Yes	Yes	Yes	?	?	?	?	No	No	No	No	No	?	?
The Bat!	Yes	Yes	Yes	Yes	Yes	Yes	account folder address book group contact	Yes ^{[Note 2]}	Yes ^{[Note 3]}	Yes ^{[Note 4]}	Yes ^{[Note 5]}	Yes	PCRE 6.2	Internal and plugins macros
Turnpike	?	?	?	?	?	?	?	?	?	?	?	?	?	?
Windows Live Mail	Yes^{[Note 6]}	Yes^{[Note 6]}	?	Yes^{[Note 6]}	?	?	?	Yes	No	?	?	?	?	?
Windows Mail	?	?	?	?	?	?	?	?	?	?	?	?	?	?
YAM	Yes	Yes	Yes	?	Yes	Yes	?	No	No	No	No	?	?	ARexx
Zimbra	Yes	Yes	Yes	Yes	Yes	Yes	any	No	No	No	No	No	?	?
Client	Message templates						Message templates individual for	Support in message templates scripts, programming languages
Client	new	reply	forward	read confirmation	save	print	Message templates individual for	JavaScript	VBScript	PHP Scripts	Python	Regular expressions	Java	Other (specify)

[N 1]
Thunderbird supports HTML templates with "Stationery" add-on.
[N 2]
The Bat! supports JavaScript in message templates with the JavaScript Macro plugin.
[N 3]
The Bat! supports VBScript in message templates with the XMP plugin.
[N 4]
The Bat! supports PHP in message templates with the XMP plugin.
[N 5]
The Bat! supports Python in message templates with the TBPyxie plugin.
[N 6]
Weak "stationery" system that only accept pages done with Word.

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This article uses material from the Wikipedia article Comparison_of_email_clients, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.

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

[Evolution_nowin-39] [N 1]
Development stopped in 2008

[Mailpile_soon-40] [N 2]
Packaging planned

[Mailpile_foss-41] [N 3]
Free Software project, source available.

[Mailpile_port-42] [N 4]
Free Software porting tangible provided OS has web browser.

[BECKY_frnews-45] [N 1]
Becky! requires FRNews or BkNews plugin installed for handling NNTP.

[plugin-48] [N 2]
i.Scribe / InScribe requires a plugin to handle LDAP.

[KDENNTP-49] [N 3]
KDE supports Newsgroups (NNTP) by the use of KNode

[pegasusaddins-52] [N 4]
Pegasus Mail can convert Newsgroup messages and/or RSS feeds to emails through the use of free add-ons.

[SelectiveDownload-53] [N 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.

[MessageDispatcher-54] [N 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.

[BAT_mygate-55] [N 7]
The Bat! requires MyGate plugin installed for handling NNTP.

[BECKY_rss-56] [N 8]
Becky! requires BkBlogReader or BkRSSviewer or B.F.R or BkRssReader plugin installed for handling RSS and ATOM.

[Claws-57] [N 9]
RSSyl plugin is required to read RSS and ATOM in Claws Mail.

[Claws2-58] [N 10]
vCalendar plugin is required to handle iCalendar in Claws Mail.

[Evolution-rss-59] [N 11]
The evolution-rss plugin (provided as a separate package by many distributions provides the RSS functionality in Evolution.

[NotesRSS-62] [N 12]
Studio Blog Reader is one RSS reader application for IBM Lotus Notes. IBM Lotus Notes version 8.x introduced a native RSS reader.

[KDEFeeds-63] [N 13]
KDE supports feeds by the use of Akregator

[KDEiCal-64] [N 14]
KDE supports iCal by the use of KOrganizer

[OutlookFeeds-65] [N 15]
Support of feeds is available in Microsoft Office Outlook 2007. Earlier versions require RSSPopper plug-in.

[OutlookiCal-66] [N 16]
Microsoft Outlook support of iCalendar varies by version.

[MTB-67] [N 17]
iCalendar is supported with an extension.

[SimpleMAPI-68] [N 18]
Mozilla Thunderbird only supports SimpleMAPI.^{[citation needed]}

[BAT_rss2pop3-69] [N 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.

[APOP-70] [N 1]
Description: RFC 1734

[HMAC-71] [N 2]
Description: RFC 2195

[SMTPAUTH-72] [N 3]
Description: RFC 2554

[AppleMailOAuth-73] [N 4]
Minimum Mac OS version 10.11. Minimum iOS version 11.

[TheBat-75] [N 5]
Professional Edition.

[WindowsMailOAuth-76] [N 6]
Windows 10 required.

[Zimbra-77] [N 7]
Zimbra Desktop supports SMTP auth, not sure about collaboration suite

[OCSP-78] [N 1]
Online Certificate Status Protocol - Description: RFC 2560

[CRL-79] [N 2]
Certificate revocation list - Description: RFC 3280

[IMAPPOP-80] [N 3]
Description: RFC 2595

[SMTPTLS-81] [N 4]
Description: RFC 2487

[M2STLS-82] [N 5]
Opera Mail does not support STARTTLS command on special ports, like 995 for pop3 connection

[TBCSP-83] [N 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.

[CITADELspam-84] [N 1]
Citadel plugs Mail into SpamAssassin

[EUDORAPGP-85] [N 2]
Eudora requires a plugin to handle PGP.

[NotesThread-86] [N 3]
First release 6.0 (September 2003), enhancements introduced in release 7.0 (August 2005)

[MTBUTF8-89] [N 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)

[MTB15-90] [N 5]
Mozilla Thunderbird adds this feature in Thunderbird 1.5.0.4

[MTBPGP-91] [N 6]
Using PGP in Thunderbird before version 78 requires Enigmail.

[MulberryEncryption-92] [N 7]
PGP/GPG and S/MIME support require a free (included) plugin.

[OEPGP-93] [N 8]
Using PGP in Outlook Express requires a plugin.

[OEPGPMIME-94] [N 9]
Outlook Express does not display PGP/MIME signed messages.

[SYLHTML-95] [N 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.

[TBIMAGE-96] [N 11]
The Bat is not able to display inline images.

[TBCRL-97] [N 12]
The Bat! supports two modes of S/MIME: Internal Implementation and via Microsoft CryptoAPI.^{[Note 13]} CRLs and OCSP are only supported in the latter mode. Internal implementation only supports Aladdin eToken Pro or Rainbow iKey1000^{[Note 14]} 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.

[98] [N 13]
"List of features of The Bat! email client".

[99] [N 14]
"The Bat! with Hardware Tokens".

[recode-100] [N 1]
It's a frequent problem for people dealing with Cyrillic/Russian in email messages that the message is not encoded in the encoding declared in its headers and thus can't be read. With such a message (with a wrong declaration of the encoding), it well might be the case that it passed through several incorrect recoding stages while it was being sent and delivered; thus it's not possible to correctly render it and read it if one uses the common type of the interface for choosing the encoding (such as the menu in Mozilla Firefox). An example of such a complex case of a wrongly declared encoding: a message was entered through a webform in the windows-1251 encoding, but the web interface incorrectly assumed that it was in latin-1; based on this assumption, it performed the recoding from latin-1 to utf-8. The result of this operation cannot be correctly decoded through the common encoding-selection interface; it can only be decoded through a two-stage recoding: first from utf-8 to latin-1, then from windows-1251 to utf-8 (assuming that one works in a Unicode environment). After it is decoded, it is desirable to store it in the recoded form instead of the original, in order to be able to read it easily afterwards, and to quote it for replies.

[SCRIBE_spell-101] [N 2]
i.Scribe / InScribe supports full integration with GNU Aspell, which is its requirement for spell checking.

[SCRIBE_jpeg-102] [N 3]
i.Scribe / InScribe requires libjpeg.

[SCRIBE_png-103] [N 4]
i.Scribe / InScribe requires libpng.

[eragenotes-105] [N 5]
Entourage can link a message to a note.

[Thunderbird_reply_format-107] [N 6]
Configurable to start replies at top or bottom, with separate configuration of signature position

[TbirdSl8Tr-108] [N 7]
Thunderbird requires SL8TR extension.

[Pegasus_reply_format-109] [N 8]
Starts replies with cursor at top, but is configurable regarding whether to include a blank space at the top for replies or not; some interleaved-posting users prefer starting the cursor at the top so they can trim the quotes

[PINE_recode-110] [N 9]
The recoding engine and interface extensions that would solve the described recoding problems have been developed as a patch for Pine; it is to be found in the package pine-4.58L-alt4.src.rpm(ftp) for ALTLinux (under the name pine-4.58L-alt2-0.4.1.diff). Its essential feature is to enable to forcibly recode messages, save them in the recoded form, and quote in replies.

[PINE_spell-111] [N 10]
Pine supports full integration with GNU Aspell or other external speller, which is its requirement for spell checking.

[FragmentedMessages-112] [N 1]
Fragmented messages make it possible, for example, to send a large audio message as several partial messages, and still have it appear to the recipient as a simple audio message rather than as an encapsulated message containing an audio message. RFC 2046

[Searchfolders-113] [N 2]
Search Folders are virtual folders that contain views of all email items matching specific search criteria. Search Folders display the results of previously defined search queries.

[Keybindings-114] [N 3]
Editable keybindings is part of GNOME, provided "Editable menu accelerators" is enabled in GNOME's "Menus & Toolbars" control applet.

[GnusNNIR-116] [N 4]
Via nnir backends such as Notmuch^[51]

[Lotus_frag-118] [N 5]
Fragmented messages are called truncated document in Lotus Notes.

[eragebackups-119] [N 6]
With Entourage 2008, you can use AppleScript and various internal/external scheduling mechanisms to create timed backups of Entourage Data.

[eragedbgrepsearch-120] [N 7]
With Entourage 2008 and later versions of 2004, you can use the Spotlight data to search what's in the Entourage database via regular expression in the file system in Terminal or via Spotlight's ...interesting...version of "regular expressions".

[MSO-121] [N 8]
supported since Office 2007.

[TBThemes-122] [N 9]
Thunderbird's interface can be user customized via the use of themes (which can reposition and skin controls)

[MulberryMBox-123] [N 10]
This is for Mulberry's 'offline browsing' capability, which is turned off by default. In the default configuration no local copy of the mail is created.

[MulberryDB-124] [N 11]
Mulberry is a dedicated IMAP client; If the IMAP server has these abilities, Mulberry can use them.

[muttindexers-128] [N 12]
Via Notmuch or other indexers.^[54]^[55]

[GrepMH-130] [N 13]
Because MH stores each letter in a separate file, it is trivially easy to (externally) search them with grep. This ease is shattered when non-raw encodings are used, such as base64.

[TBEncryptedDB-131] [N 14]
The Bat! Pro support two methods access to program when database is encrypted: password authorization and token authorization; Voyager support only password authorization and encrypted database is default and only available storage method.

[TB_STATIONERY_EXT-133] [N 1]
Thunderbird supports HTML templates with "Stationery" add-on.

[BAT_js-134] [N 2]
The Bat! supports JavaScript in message templates with the JavaScript Macro plugin.

[BAT_XMP-135] [N 3]
The Bat! supports VBScript in message templates with the XMP plugin.

[BAT_XMP2-136] [N 4]
The Bat! supports PHP in message templates with the XMP plugin.

[BAT_TBPyxie-137] [N 5]
The Bat! supports Python in message templates with the TBPyxie plugin.

[STATIONERY-138] [N 6]
Weak "stationery" system that only accept pages done with Word.

[1] [1]
Elm Mail System GPL

[2] [2]
"Pine License". Archived from the original on 2018-06-02. Retrieved 2006-02-24.

[wikidata-9ee1744d9006f69749e8619eb5829dd9e67483b3-v11-4] [3]
Eduardo Chappa (2 June 2022). "New version 2.26".

[wikidata-75c48ad5dd398410354facb41640eda8b09a491e-v11-5] [4]
"Update History". Retrieved 4 December 2023.

[wikidata-df241153be7193d078100566a22d5e737f3b18f5-v11-6] [5]
"Release version 996".

[wikidata-73744c60cb1e024d75194dee6ab8ca687ba63e6e-v11-7] [6]
Paul Mangan (20 November 2023). "Claws Mail 4.2.0 and 3.20.0 Unleashed!!!". Retrieved 29 November 2023.

[wikidata-129a9c8c667e89eb14c931eb9ee02628389f4481-v11-8] [7]
"ELM - Electronic Mail for UNIX".

[eudorabirth-9] [8]
"The Birth of Eudora". Archived from the original on 2002-11-08. Retrieved 2007-04-10.

[wikidata-4622dc1eef58e85e7abe9f40dbb54fce0c5e7947-v11-10] [9]
"Evolution 3.52.1 2024-04-19". 19 April 2024. Retrieved 22 April 2024.

[wikidata-21062f2584346468a9bf095d96f29d21bbdd2520-v11-11] [10]
"44.1 · Tags · GNOME / Geary · GitLab".

[gnusrelease-12] [11]
"GNUS: a NNTP based news reader for GNU Emacs (1 of 2)". Archived from the original on 2016-03-03. Retrieved 2008-08-04.

[wikidata-04efeae08dfe7c06c7d57e35cf86aa1920c1ab6b-v11-13] [12]
"GroupWise 18.4 has been released". 14 March 2022. Retrieved 30 March 2022.

[wikidata-93a77e4d7f7a5e45c833ff4677b9fdc78c7aefcf-v11-14] [13]
"Unlocking Innovation - Explore the Power of HCL Domino v14". 7 December 2023.

[wikidata-05f606edd1176660b4e60fb4f4fb04418bcd9490-v11-15] [14]
"Release v6.2.27".

[wikidata-2ff8e87da988f8fcbac415ac82c5737f33f6c6d1-v11-16] [15]
"Release 6.802". 5 April 2024. Retrieved 23 April 2024.

[wikidata-7bf419ff25d11f377310856629f54eb246de0c9b-v11-17] [16]
"KMail - KDE Applications".

[18] [17]
Alpha

[19] [18]
tbd 2017

[20] [19]
1.00 RC

[21] [20]
"Releases - mailpile/Mailpile". Retrieved 29 June 2020 – via GitHub.

[22] [21]
"Release notes for Current Channel". Microsoft. Retrieved 2024-01-10.

[23] [22]
"Update history for Office for Mac". Microsoft Docs. 29 December 2023.

[OfficeOneTimePurchase-24] [23]
"Update history for Office LTSC 2021 and Office 2021". 29 December 2023.

[25] [24]
Warren, Tom. "Microsoft Office 2021 will launch on October 5th". The Verge. Retrieved October 5, 2021.

[wikidata-63e53fb5e45b128a2db0e66a5b0b826f963f1867-v11-26] [25]
"Thunderbird — Release Notes (115.10.0) — Thunderbird". Retrieved 21 April 2024.

[wikidata-c76bbca54bb198cb45ea824e1031d43ee8e84fc9-v11-27] [26]
Kevin J. McCarthy (9 March 2024). "mutt 2.2.13 released". Retrieved 10 March 2024.

[28] [27]
"Opera 12 and Opera Mail security update". 2016-02-16.

[wikidata-5cd66b504464f2ed18c4250693f5fcbebe5d0d39-v11-29] [28]
"Pegasus Mail v4.8x Release Notes". 14 February 2022.

[wikidata-6eca140094a18e2b85aa790debbc07eff3823502-v11-30] [29]
"Pine Information Center--Pine Release Chronology & Version Changes". Archived from the original on 25 November 2005.

[wikidata-28a796812f4737a3901ee65b38cc1a2bcf9b2b43-v11-31] [30]
"Update 1.6.6 released". 20 January 2024. Retrieved 30 January 2024.

[wikidata-38f2c343b44030bedfa950e701ebbeb28e3baca2-v11-32] [31]
"SeaMonkey 2.53.18.2 released". 28 March 2024. Retrieved 28 March 2024.

[wikidata-1e7d13cd5690813336e1053d0c31e9c16e2bb3aa-v11-33] [32]
"SquirrelMail Downloads". Retrieved 19 November 2020.

[wikidata-c2bdd665ec98112548cbd6bf4b5b0555a24c4467-v11-34] [33]
"SquirrelMail - Webmail for Nuts!". Retrieved 8 August 2021.

[wikidata-cca9779933858082f40f0494e9ebef38b4f980e7-v11-35] [34]
"31 Jan 2018 Sylpheed 3.7 (stable) released". 31 January 2018.

[wikidata-1eab466729162c8ea14a18fcc491cc037f5fab1d-v11-36] [35]
"Download The Bat!". Retrieved 13 January 2024.

[wikidata-40d0bad6e7793b95b5e0c8815906c0fbe0891862-v11-37] [36]
"Release 2.9". 24 December 2013. Retrieved 23 July 2018.

[38] [37]
https://wiki.zimbra.com/wiki/Zimbra_Releases

[43] [38]
"Other Programming Projects and Downloads". Archived from the original on 2007-04-04. Retrieved 2007-04-06.

[44] [39]
"PC-PINE-3.96 README". Retrieved 2007-04-06.^{[permanent dead link]}

[46] [40]
(setq gnus-select-method '(pop3 "pop.example.com"))
(setq gnus-secondary-select-methods '((nntp "news.gnus.org")))
After configuring Gnus for POP3, you can use the gnus-group-get-new-news command to retrieve new messages from your POP3 server.

[47] [41]
"w32-send-mapi.el".

[50] [42]
Write to LDAP still missing after 10 years, Mozilla bug 86405

[51] [43]
Add-ons include MesQuilla ExQuilla Exchange Web Services (alpha) (see also ExQuilla for Microsoft Exchange) and Provider for Microsoft Exchange

[60] [44]
"GNU emacs - rss".

[61] [45]
via org-mode

[bugzilla.mozilla.org-74] [46]
"335924 - No authentication with DIGEST-MD5".

[87] [47]
"HCL Product Documentation".

[88] [48]
Sort Your Emails by Conversation in Outlook 2010 - How-To Geek

[104] [49]
"Configure KMail: Appearance Page". KDE (Documentation page). Archived from the original on May 30, 2018. Retrieved May 30, 2018.

[106] [50]
"Header Tools Lite". 8 September 2022.

[notmuch-115] [51]
Ingebrigtsen, Lars Magne (2015). "The Gnus Newsreader". Free Software Foundation, Inc. Retrieved 2016-11-21.

[117] [52]
"Find product documentation and support". IBM.

[125] [53]
"Compressed folders patch for Mutt".

[126] [54]
Using Notmuch with bare Mutt, the old fashioned way

[127] [55]
"MuttWiki: UserCases/SearchingMail". Archived from the original on 2013-12-10. Retrieved 2013-02-13.

[129] [56]
"Pegasus Mail & Mercury - Re: IDLE". Archived from the original on 2014-03-11. Retrieved 2014-03-11.

[132] [57]
"IBM Docs".

[139] [58]
"Starting with the version 6.0 The Bat! supports IDN (Internationalized Domain Names))".^{[better source needed]}

[140] [59]
"International email addresses - Outlook". support.office.com. Archived from the original on 2016-10-28. Retrieved 2016-10-27.

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[Note 2]

[Note 3]

[Note 4]

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[Note 1]

[40]

[41]

[Note 2]

[Note 3]

[42]

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[Note 5]

[Note 6]

[Note 7]

[Note 8]

[Note 9]

[Note 10]

[Note 11]

[44]

[45]

[Note 12]

[Note 13]

[Note 14]

[Note 15]

[Note 16]

[Note 17]

[Note 18]

[Note 19]

[Note 1]

[Note 2]

[Note 3]

[Note 4]

[46]

[Note 5]

[Note 6]

[Note 7]

[Note 1]

[Note 2]

[Note 3]

[Note 4]

[Note 5]

[Note 6]

[Note 1]

[Note 2]

[Note 3]

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[Note 5]

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[Note 14]

[Note 1]

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

Comparison_of_email_clients

Comparison of email clients

General

Release history

Operating system support

Protocol support

Communication and access protocol support

Integration protocol support

Authentication support

SSL and TLS support

Features

General features

Messages features

Database, folders and customization

Templates, scripts and programming languages

Internationalization

See also

References

External links

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