Poniższe tabele porównują ogólne i techniczne informacje na temat programów pocztowych. W celu uzyskania bardziej szczegółowych informacji na temat danego klienta pocztowego proszę skorzystać z artykułów poświęconych właśnie tylko tym programom. Artykuł ten może być nieaktualny lub zawierać niepełne dane.

==Ogólne==
Podstawowe informacje na temat programów pocztowych: autor/firma, licencja/cena itd.
{| border="1" cellpadding="1" cellspacing="0" style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center; width: 100%;"
|-style="background: #ececec;"
! style="width:12em" |
! Autor
! Cena (USD)
! FOSS
! Licencja
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Citadel
| citadel.org
| darmowy
| 
| GPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Claws Mail
| Claws Mail Team
| darmowy
| 
| GPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | FastTrackMail
| InternetSoft Corporation
| $29
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Eudora
| Qualcomm
| darmowy w wersji (Light i Pro z reklamami), $49 (Pro)
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Lotus Notes
| Lotus Software / IBM
| [https://www-112.ibm.com/software/howtobuy/buyingtools/paexpress/Express?P0=E1&part_number=D5CPILL,D5CS2LL,D53T5LL&catalogLocale=en_US&Locale=en_US&country=USA&S_TACT=none&S_CMP=none wysokość opłat online]
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | KMail
| KDE
| darmowy
| 
| GPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mail
| Apple Computer 
| Część systemu Mac OS X
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mozilla Mail/SeaMonkey m
| Mozilla Foundation
| darmowy, część Mozilla Application Suite
| 
| MPL, potrójna licencja MPL/GPL/LGPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mozilla Thunderbird
| Mozilla Foundation
| darmowy
| 
| MPL, potrójna licencja MPL/GPL/LGPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Microsoft Outlook
| Microsoft
| Część Microsoft Office
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mulberry
| ISAMET
| $35,95
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mutt
| Michael Elkins
| darmowy 
| 
| GPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Novell Evolution
| Ximian
| darmowy 
| 
| GPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Opera Mail
| Opera Software
| darmowy, część przeglądarki Opera
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Outlook Express
| Microsoft
| część Microsoft Windows
| 
| Własnościowa
|- style="border: 1px gray solid"

! style="text-align: left; background: #ececec" | Pine
| Uniwersytet w Waszyngtonie
| darmowy 
| 
| [http://www.washington.edu/pine/overview/legal.html Pine License]
|- style="border: 1px gray solid"

! style="text-align: left; background: #ececec" | i.Scribe/InScribe
| Memecode
| darmowy/$20
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Sylpheed
| Hiroyuki Yamamoto
| darmowy
| 
| GPL
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | The Bat!
| RitLabs
|
[http://www.ritlabs.com/en/buy_tb.php wysokość opłat online]
| 
| Własnościowa
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Zimbra
| Zimbra
| darmowy
| 
| MPL
|-style="background: #ececec;"
!
! Autor
! Cena (USD)
! Open Source
! Licencja
|}

==Historia wydań==
Krótka informacja na temat historii produktu, jego wydań.
{| border="1" cellpadding="1" cellspacing="0" style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center; width: 100%;"
|- style="background: #ececec; border: 1px gray solid"
! rowspan="2" style="width:12em" | Program
! colspan="2" | Pierwsze publiczne wydanie
! colspan="2" | Pierwsze stabilne wydanie
! colspan="2" | Ostatnie stabilne wydanie
! colspan="2" | Ostatnie wydanie testowe
|- style="background: #ececec"
! Data
! Wersja
! Data
! Wersja
! Data
! Wersja
! Data
! Wersja
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Citadel
| 1987
| style="background: white;" | ?
| 1988
| 1.00
| Grudzień 2005
| 6.61
| style="background: white;" | ?
| style="background: white;" | ?
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Claws Mail
| Maj 2001
| style="background: white;" | 0.4.67
| Styczeń 2005
| 1.0.0
| Grudzień 2006
| 2.6.1
| style="background: white;" | Styczeń 2007
| style="background: white;" | 2.7.0 RC3
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Eudora
| 1996
| style="background: white;" | ?
| 1988
| style="background: white;" | ?
| 12 lutego 2006
| 7.0.1.0
| style="background: white;" | ?
| style="background: white;" | ?
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Lotus Notes
|  1989
|  1.0
| 1991
| style="background: white;" | ?
| Marzec 2006
| 7.0.1
| 29 marca 2006
| 7.0.2 build 232
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | KMail
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| 25 stycznia 2007
| 1.9.6
| style="background: white;" | ?
| style="background: white;" | ?
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mail
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| 13 marca 2006
| 2.0.7
| style="background: white;" | ?
| style="background: white;" | ?
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mozilla Mail & Newsgroups
| 7 grudnia 1998
| "Preview"
| 19 marca 1999
| M3
| 21 września 2005
| 1.7.12
|
|
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mozilla Thunderbird
| 28 lipca 2003
| 0.1
| 7 grudnia 2004
| 1.0
| 18 kwietnia 2007
| 2.0
| 
| 
|- style="border: 1px gray solid"

! style="text-align: left; background: #ececec" | Microsoft Outlook
| 1997
| 97
| 1997
| 97
| style="background: white;" | ?
| 11.8010.6568
(2003SP2)
| style="background: white;" | ?
| 12 (2007)
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mulberry
| 20 września 1996
| 1.0
| 20 września 1996
| 1.0
| 20 maja 2005
| 4.0
| style="background: white;" | ?
| style="background: white;" | ?
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mutt
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| 12 lutego 2004
| 1.4.2.1
| 15 września 2005
| 1.5.11
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Novell Evolution
| style="background: white;" | ?
| style="background: white;" | ?
| 3 grudnia 2001
| 1.0
| 30 maja 2006
| 2.6.2
| style="background: white;" | ?
| 2.7.1
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Opera Mail
| Wrzesień 1996
| 2.1b1
| Grudzień 1996
| 2.1
| 15 sierpnia 2007
| 9.23
| 4 września 2007
| 9.5 alpha
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Outlook Express
| 1996
| 3.0
| style="background: white;" | ?
| style="background: white;" | ?
| 25 października 2001
| 6.0
| style="background: white;" | ?
| style="background: white;" | ?
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Pine
| 15 stycznia 1992
| 2.00
| style="background: white;" | ?
| style="background: white;" | ?
| 28 września 2005
| 4.64
| style="background: white;" | ?
| style="background: white;" | ?
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | i.Scribe/InScribe
| 1999
| 1.00
| style="background: white;" | ?
| style="background: white;" | ?
| Listopad 2005
| 1.88
| Grudzień 2005
| 1.89
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Sylpheed
| Styczeń 2000
| 0.1.0
| Grudzień 2004
| 1.0.0
| 16 stycznia 2007
| 2.3.1
| style="background: white;" | 7 lutego  2007
| style="background: white;" | 2.4.0.beta3
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | The Bat!
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| 10 marca 2008
| 4.0.18
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Zimbra
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| style="background: white;" | ?
| Listopad 2005
| 3.0 Beta 2
| style="background: white;" | ?
| style="background: white;" | ?
|- style="background: #ececec; border: 1px gray solid"
! rowspan="2" style="width:12em" | Program
! colspan="2" | Pierwsze publiczne wydanie
! colspan="2" | Pierwsze stabilne wydanie
! colspan="2" | Ostatnie stabilne wydanie
! colspan="2" | Ostatnie wydanie testowe
|- style="background: #ececec"
! Data
! Wersja
! Data
! Wersja
! Data
! Wersja
! Data
! Wersja
|}

==Obsługa przez systemy operacyjne==
System operacyjny obsługujący bez emulacji dane programy pocztowe.
{| border="1" cellpadding="1" cellspacing="0" style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center; width: 100%; table-layout: fixed;"
|-style="background: #ececec;"
! style="width:12em" |
! Microsoft Windows
! Mac OS X
! Linux
! BSD
! Unix
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Citadel
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Claws Mail
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Eudora
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Lotus Notes
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | KMail
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec"| Mail
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mozilla Mail & Newsgroups
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mozilla Thunderbird
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Microsoft Outlook
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mulberry
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Mutt
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Novell Evolution
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Opera Mail
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Outlook Express
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Pine
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | i.Scribe/InScribe
| 
|  (w realizacji)
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Sylpheed
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | The Bat!
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
! style="text-align: left; background: #ececec" | Zimbra
| 
| 
| 
| 
| 
|-style="background: #ececec;"
!
! Microsoft Windows
! Mac OS X
! Linux
! BSD
! Unix
|}

==Obsługa protokołów==
Wykaz protokołów oraz standardów obsługiwanych przez dany program pocztowy.

{| border="1" cellpadding="1" cellspacing="0" style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center; width: 100%; table-layout: fixed;"
|- style="background: #ececec;"
! rowspan="2" style="width:12em" | Program
! rowspan="2" | POP3
! rowspan="2" | IMAP4
! rowspan="2" | SMTP
! rowspan="2" | NNTP
! colspan="2" | LDAP
! rowspan="2" | IMSP
! rowspan="2" | ACAP
! colspan="4" | Czytnik kanałów
! rowspan="2" | iCalendar
|- style="background: #ececec"
! v2
! v3
! RSS 0.91
! RSS 1.0
! RSS 2.0
! ATOM
|- style="border: 1px gray solid"
| Claws Mail
| 
| 
| 
| 
| 
|
| '''''???'''''
| '''''???'''''
| 
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki RSSyl)''
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki RSSyl)''
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki RSSyl)''
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki vCalendar)''
|- style="border: 1px gray solid"
| KMail
| 
| 
| 
| 
| '''''???'''''
|
| '''''???'''''
| '''''???'''''
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Lotus Notes
| 
| 
| 
| 
| 
|
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Mail
| 
| 
| 
| 
| '''''???'''''
| '''''???'''''
| '''''???'''''
| '''''???'''''
| '''''???'''''
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Mozilla Thunderbird
| 
| 
| 
| 
| 
| 
| '''''???'''''
| 
| 
| 
| 
| 
| style="background: #ffffdd;" | Tak<br />(z wtyczką)
|- style="border: 1px gray solid"
| Mulberry
| 
| 
| 
| 
| 
|
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Mutt
| 
| 
| style="background: #ffffdd;" | nie (używa sendmaila)
| 
| 
|
| '''''???'''''
| '''''???'''''
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Novell Evolution
| 
| 
| 
| 
| 
|
|
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Opera Mail
| 
| 
| 
| 
| 
| 
| '''''???'''''
| '''''???'''''
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Outlook
| 
| 
| 
| 
| '''''???'''''
|
| '''''???'''''
| '''''???'''''
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Outlook Express
| 
| 
| 
| 
| '''''???'''''
|
| '''''???'''''
| '''''???'''''
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Pine
| 
| 
| 
| 
| 
|
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Sylpheed
| 
| 
| 
| 
| 
|
| '''''???'''''
| '''''???'''''
| 
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki RSSyl)''
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki RSSyl)''
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki RSSyl)''
| style="background: #ffffdd;" | Tak<br />''(wymaga wtyczki vCalendar)''
|- style="border: 1px gray solid"
| The Bat!
| 
| 
| 
| style="background: #ffffdd;" | Tak<br />''(z wtyczką MyGate)''
| 
|
| 
| 
| style="background: #ffffdd;" | Tak<br />''(z wtyczkami rss2mail, rss2pop3)''
| style="background: #ffffdd;" | Tak<br />''(z wtyczkami rss2mail, rss2pop3)''
| style="background: #ffffdd;" | Tak<br />''(z wtyczkami rss2mail, rss2pop3)''
| style="background: #ffffdd;" | Tak<br />''(z wtyczkami rss2mail, rss2pop3)''
| 
|- style="border: 1px gray solid"
|- style="background: #ececec;"
! rowspan="2" style="width:12em" | Program
! rowspan="2" | POP3
! rowspan="2" | IMAP4
! rowspan="2" | SMTP
! rowspan="2" | NNTP
! colspan="2" | LDAP
! rowspan="2" | IMSP
! rowspan="2" | ACAP
! colspan="4" | Czytnik kanałów
! rowspan="2" | iCalendar
|- style="background: #ececec"
! v2
! v3
! RSS 0.91
! RSS 1.0
! RSS 2.0
! ATOM
|}

* KDE obsługuje grupy dyskusyjne (NNTP) przy użyciu KNode
* KDE obsługuje kanały informacyjne (ang. feeds) przy użyciu Akregator
* [http://www.openntf.org/Projects/pmt.nsf/ProjectHome?ReadForm&Query=Studio%20Blog%20Reader Studio Blog Reader] jest jednym z czytników RSS dla Lotus Notes

===Uwierzytelnianie===
{| border="1" cellpadding="1" cellspacing="0" style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center; width: 100%; table-layout: fixed;"
|- style="background: #ececec; border: 1px gray solid"
! rowspan="2" style="width:12em" | Program
! colspan="8" | Uwierzytelnianie
|- style="background: #ececec"
! Zwykłe
! MSN
(NTLM)
! Compuserve (RPA)
! MD5 APOP
! MD5 CRAM-HMAC
! ze sprzętowym tokenem
PKCS#11
! Biometryczne
! SMTP Auth
|- style="border: 1px gray solid"
| KMail
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Lotus Notes
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Mozilla Thunderbird
| 
|
|
|
|
|
|
| 
|- style="border: 1px gray solid"
| Mulberry
|
|
|
|
|
|
|
|
|- style="border: 1px gray solid"
| Mutt
|
|
|
|
|
|
|
|
|- style="border: 1px gray solid"
| Novell Evolution
| 
| 
| 
| 
| 
|
|
| 
|- style="border: 1px gray solid"
| Opera Mail
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Outlook
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Outlook Express
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Pine
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Sylpheed Claws
| 
|
|
| 
| 
|
|
| 
|- style="border: 1px gray solid"
| TheBat!
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
|- style="background: #ececec;"
! rowspan="2" style="width:12em" | Program
! colspan="8" | Uwierzytelnianie
|- style="background: #ececec"
! Zwykłe
! MSN
(NTLM)
! Compuserve (RPA)
! MD5 APOP
! MD5 CRAM-HMAC
! ze sprzętowym tokenem<br />PKCS#11
! Biometryczne
! SMTP Auth
|}

* Opis: RFC-2554
* Opis: RFC-1734
* Opis: RFC-2095

===Obsługa SSL oraz TLS===
{| border="1" cellpadding="1" cellspacing="0" style="font-size: 85%; border: gray solid 1px; border-collapse: collapse; text-align: center; width: 100%; table-layout: fixed;"
|- style="background: #ececec; border: 1px gray solid"
! rowspan="2" style="width:12em" | Program
! colspan="2" | Szyfrowane POP3
! colspan="2" | Szyfrowane IMAP4
! colspan="2" | Szyfrowane SMTP
! colspan="2" | Szyfrowane NNTP
! colspan="2" | Szyfrowane LDAP
|- style="background: #ececec border: 1px gray solid"
! SSL
! TLS&nbsp;
! SSL
! TLS&nbsp;
! SSL
! TLS&nbsp;
! SSL
! TLS
! SSL
! TLS
|- style="border: 1px gray solid"
| KMail
| 
| 
| 
| 
| 
| 
| 
| 
|
|
|- style="border: 1px gray solid"
| Lotus Notes
|
|
|
|
|
|
|
|
|
|
|- style="border: 1px gray solid"
| Mozilla Thunderbird
| 
| 
| 
| 
| 
| 
| 
|
| 
|
|- style="border: 1px gray solid"
| Mulberry
|
|
|
|
|
|
|
|
|
|
|- style="border: 1px gray solid"
| Mutt
|
|
|
|
|
|
|
|
|
|
|- style="border: 1px gray solid"
| Novell Evolution
| 
| 
| 
| 
| 
| 
| 
| 
|
|
|- style="border: 1px gray solid"
| Opera Mail
|
| &nbsp;
|
| &nbsp;
|
| &nbsp;
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Outlook
| 
| 
| 
| 
| 
| 
|
|
|
|
|- style="border: 1px gray solid"
| Outlook Express
| 
| 
| 
| 
| 
| 
|
|
|
|
|- style="border: 1px gray solid"
| Pine
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| Sylpheed Claws
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
|- style="border: 1px gray solid"
| TheBat!
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
|- style="background: #ececec; border: 1px gray solid"
! rowspan="2" style="width:12em" | Program
! colspan="2" | Szyfrowane POP3
! colspan="2" | Szyfrowane IMAP4
! colspan="2" | Szyfrowane SMTP
! colspan="2" | Szyfrowane NNTP
! colspan="2" | Szyfrowane LDAP
|- style="background: #ececec"
! SSL
! TLS&nbsp;
! SSL
! TLS&nbsp;
! SSL
! TLS&nbsp;
! SSL
! TLS
! SSL
! TLS
|}

The following tables compare general and technical information between a number of e-mail client programs. Please see the individual products articles (if they have one) for further information. This article is not all-inclusive or necessarily up-to-date.

==General==
Basic general information about the clients: creator/company, license/price etc.
{| class="wikitable sortable" style="width: auto; text-align: center; font-size: smaller; table-layout: fixed;"
|-
! e-mail program
! Creator
! Cost
! Software license
|-
! @Mail Open
| @Mail
| 
| Apache License
|-

! Alpine
| University of Washington
| 
| Apache License
|-

! Citadel
| citadel.org
| 
| GNU GPL
|-

! Claws Mail
| the Claws Mail team
| 
| GNU GPL
|-
! Cone
| Courier Mail Server developers
| 
| GNU GPL
|-

! Courier (formerly Calypso)
| Micro Computer Systems, Inc., continued by Rose City Software
|  (as of version 3.5)
| proprietary software
|-
! Elm
| Dave D. Taylor, Sydney Weinstein, Bill Pemberton, Michael Elkins, Kari Hurtta
| 
| [http://www.elmme-mailer.org/NOTICE Elm Mail System GPL]
|-
! Eudora
| Qualcomm
| 
| Future release, Penelope, will be Free/Open Source based on Mozilla Thunderbird
|-

! Eureka Email
| Sean O'Connor
| 
| proprietary software
|-

! Foxmail
| Tencent 
| 
| proprietary software
|-

! GroupWise
| Novell
| Included with GroupWise mailbox license
| proprietary software
|-
! Gnus
| Gnus team
| 
| GNU GPL
|-
! KMail
| The KMail Team
| 
| GNU GPL
|-

! Kerio WebMail
| Kerio Technologies
| Part of Kerio MailServer
| proprietary software
|-
! Lotus Notes
| Lotus Software / IBM
| 
| proprietary software
|-

! Mail
| Apple Inc. 
| 
| proprietary software
|-
! Mailsmith
| Bare Bones Software
| US$75 incl. SpamSieve
| proprietary software
|-

!  nmh/MH
| RAND Corporation
| 
| BSDL
|-

! Microsoft Entourage
| Microsoft
| Part of Microsoft Office for Mac
| proprietary software
|-

! Microsoft Office Outlook
| Microsoft
| Part of Microsoft Office, US$109 stand-alone
| proprietary software
|-

! Mozilla Mail & Newsgroups
| Mozilla Foundation
| , part of Mozilla Application Suite
| MPL, MPL/GNU GPL/GNU LGPL tri-license
|-

! Mozilla Thunderbird
| Mozilla Foundation
| 
| MPL, MPL/GNU GPL/GNU LGPL tri-license
|-

! Mulberry
| Cyrus Daboo (previously Cyrusoft International, Inc./ISAMET
|  (as of version 4.0.5)
| ??? (old versions), Apache License
|-

! Mutt
| Michael Elkins
| 
| GNU GPL
|-

! Netscape Messenger 9
| Netscape Communications
| 
| MPL, MPL/GNU GPL/GNU LGPL tri-license
|-

! Novell Evolution
| Ximian
| 
| GNU GPL
|-

! Open-Xchange
| Open-Xchange
| 
| GNU GPL
|-

! Opera Mail
| Opera Software
| , Part of Opera
| Freeware
|-

! Outlook Express
| Microsoft
| 
| proprietary software
|-

! Pegasus Mail
| David Harris
|  
| 
|-

! Pine
| University of Washington
| 
| [http://www.washington.edu/pine/overview/legal.html Pine License] 
|-

! Pocomail
| Poco Systems
| $40
| Proprietary Software
|-