Comparison of Mail Servers - Feature Comparison

Feature Comparison

00000 ! 00000 !Server OS support 00000 !Features 00000 !Storage 00000 !
Mail server Linux/Unix Windows Mac OS SMTP POP3 IMAP IMAP IDLE SMTP over TLS POP over TLS IPv6 NNTP SSL Webmail ActiveSync Database Filesystem Other License
agorum core Yes Yes No Yes No Yes ? No No ? No Yes Yes No Yes No No Open Source/GPLv2
Apache James Yes Yes Yes Yes Yes Yes ? Yes Yes ? Yes Yes No No Yes Yes No Open Source/ASLv2
Atmail Yes No Yes Yes Yes Yes Yes Yes Yes ? No Yes Yes Yes Yes Yes No Proprietary (100 user/30 day demo)
Axigen Yes Yes No Yes Yes Yes Yes Yes Yes No No Yes Ajax & Basic Yes No No Yes Proprietary (free version: email 100 users / calendar 5 users)
Citadel Yes No Yes Yes Yes Yes ? Yes Yes Yes ? Yes Yes No Yes No No Open Source/GPLv3
CommuniGate Pro Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Proprietary
Courier Mail Server Yes No Yes Yes Yes Yes Yes Yes Yes Yes ? Yes Yes No No maildir No Open Source
Cyrus IMAP Yes No Yes No Yes Yes Yes No Yes Yes Yes Yes No No Yes (indexes) Yes Yes Open Source/BSD
DBMail Yes via Cygwin Yes Postfix, Exim, Sendmail, qmail Yes Yes Yes Postfix, Exim, Sendmail, qmail Yes Yes ? Yes No No PostgreSQL, MySQL, SQLite No No GPL
Digital Integration iMail5 Yes Yes No Yes Yes Yes Yes Yes Yes ? No Yes Yes No Yes Yes Yes Proprietary
Dovecot Yes No Yes No Yes Yes Yes Yes Yes Yes No Yes No No Yes maildir, mbox, dbox No Open Source/Mixed: MIT and LGPL 2.1
Eudora Internet Mail Server No No Yes Yes Yes Yes ? No No ? No No No No No No Yes Proprietary
Exim Yes via Cygwin Yes Yes Dovecot, UW IMAP Dovecot, UW IMAP Dovecot, UW IMAP Yes No Yes No Yes No No Yes Yes No Open Source/GPL
FirstClass Yes Yes Yes Yes Yes Yes ? Yes Yes ? Yes Yes Yes Yes Yes Yes Yes Proprietary
Gordano Messaging Suite Yes Yes No Yes Yes Yes ? Yes Yes ? No Yes Yes No Yes Yes Yes Proprietary
GroupWise Yes Yes No Yes Yes Yes ? Yes Yes ? ? Yes Yes Yes Yes No No Proprietary
Hexamail Server Yes Yes No Yes Yes Yes ? Yes Yes ? No Yes Yes No No Yes No Proprietary
Mail server Linux/Unix Windows Mac OS SMTP POP3 IMAP IMAP IDLE SMTP over TLS POP over TLS IPv6 NNTP SSL Webmail ActiveSync Database Filesystem Other License
hMailServer No Yes No Yes Yes Yes Yes V 5.0 V 5.0 Yes No V 5.0 Yes No Yes No No GNU GPL (V5.0 Proprietary)
IBM Lotus Domino Yes Yes No Yes Yes Yes ? Yes Yes ? Yes Yes Yes Yes Yes No No Proprietary
IndiMail Yes No Yes Yes Yes Yes ? Yes Yes Yes No Yes No No Yes Yes No Open Source/GPLv3
Ipswitch IMail Server No Yes No Yes Yes Yes ? Yes Yes ? No Yes Yes Yes No Yes No Proprietary
JMail Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Proprietary
Kerio Connect Yes Yes Yes Yes Yes Yes ? Yes Yes ? Yes Yes Yes Yes Yes Yes No Proprietary
Kolab Yes No No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Free Software/GPLv3
MagicMail Yes No No Yes Yes Yes ? Yes Yes ? No Yes Yes No Yes Yes Yes Proprietary
MailSite Fusion No Yes No Yes Yes Yes ? Yes Yes ? No Yes Yes Yes Yes Yes Yes Proprietary
Mailtraq No Yes No Yes Yes Yes Yes Yes Yes ? Yes Yes Yes No Yes Yes Yes Proprietary
MDaemon Mail Server No Yes No Yes Yes Yes Yes Yes Yes No No Yes Yes Yes Yes Yes No Proprietary
Meldware Mail Server Yes Yes Yes Yes Yes Yes ? Yes Yes ? ? Yes Yes No Yes Yes No Open source/LGPL
Mercury Mail Transport System No Yes No Yes Yes Yes ? Yes Yes ? No Yes Yes No No Yes No Proprietary/donationware
Microsoft Exchange Server No Yes No Yes Yes Yes Yes Yes Yes Yes (2007 sp1 onwards) Yes Yes Yes Yes ESE only Yes (up to 2003 only) Yes Proprietary
EULA
Mirapoint Yes No No Yes Yes Yes ? Yes Yes ? No Yes Yes No Yes Yes Yes Proprietary
NetMail Yes Yes No Yes Yes Yes ? Yes Yes ? ? Yes Yes No Yes No No Proprietary
OpenSMTPD Yes No Yes Yes No No No Yes No Yes No Yes No No possible through custom backends Yes No ISC
Open-Xchange Yes No No Yes Yes Yes ? Yes Yes ? ? Yes Yes Yes Yes No No Dual license (GPL)
Mail server Linux/Unix Windows Mac OS SMTP POP3 IMAP IMAP IDLE SMTP over TLS POP over TLS IPv6 NNTP SSL Webmail ActiveSync Database Filesystem Other License
Oracle Communications Messaging Server Yes No No Yes Yes Yes ? Yes Yes ? No Yes Yes No Yes Yes No Proprietary
Postfix Yes No Yes Yes Dovecot, UW IMAP Dovecot, UW IMAP Dovecot, UW IMAP Yes No Yes No Yes No No Yes Yes Yes Open source/IBM Public License
qmail Yes No Yes Yes Yes No No No No via Qsmtp ? No No No No Yes No Public domain
Qpopper Yes via Cygwin Yes No Yes No No No Yes ? No Yes No No No Yes Yes BSD-style
Sendmail Yes No Yes Yes Dovecot, UW IMAP Dovecot, UW IMAP Dovecot, UW IMAP Yes No Yes No Yes No No ? Yes ? Open source/Sendmail License
SparkEngine Yes Yes Yes Yes No No No Yes No ? No Yes No No Yes Yes Yes Proprietary
SurgeMail Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes No Yes Yes Yes Proprietary (Free 5 user)
Synovel Collabsuite Yes No No Yes Yes Yes ? Yes Yes ? ? Yes Yes No Yes Yes ? Open Source/Proprietary
UW IMAP Yes Yes Yes No Yes Yes Yes No Yes ? No Yes WebPine No Yes (Indexes) Yes No Open Source/Apache license
WinGate No Yes No Yes Yes Yes Yes Yes Yes No No Yes Yes No No Yes No Proprietary
Xeams Yes Yes Yes Yes Yes Yes ? Yes Yes ? No Yes No No No Yes No Proprietary/Free with support option
Zarafa Yes No No External Yes Yes Yes External Yes No No Yes Yes Yes Yes Yes No Open Source/Proprietary
Zimbra Yes No Yes Yes Yes Yes Yes Yes Yes No No Yes Yes Yes Yes Yes No Open Source/Proprietary
Mail server Linux/Unix Windows Mac OS X SMTP POP3 IMAP IMAP IDLE SMTP over TLS POP over TLS IPv6 NNTP SSL Webmail ActiveSync Database Filesystem Other License
zzzzz ! zzzzz !Server OS support zzzzz !Features zzzzz !Storage zzzzz !

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    “A snake, with mottles rare,
    Surveyed my chamber floor,
    In feature as the worm before,
    But ringed with power.”
    —Emily Dickinson (1830–1886)

    “But the best read naturalist who lends an entire and devout attention to truth, will see that there remains much to learn of his relation to the world, and that it is not to be learned by any addition or subtraction or other comparison of known quantities, but is arrived at by untaught sallies of the spirit, by a continual self-recovery, and by entire humility.”
    —Ralph Waldo Emerson (1803–1882)