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This is a comparison Features of 44 mail servers: mail transfer agents, mail delivery agents, and other computer software which provide e-mail services.

email server

email server

Linux-based mail servers are built using a number of components because a Linux environment is, by default, a toolbox operating system. A stock Linux server already has internal mail. To allow the server to send external emails, a Mail Transfer Agent such as sendmail, postfix or exim is required. Mail is read either through direct access (shell login) or mailbox protocols like POP and IMAP.

Server OS support Features Storage Users
Mail server Linux/Unix Windows Mac OS SMTP POP3 IMAP IMAP IDLE SMTPoverTLS POPoverTLS 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 GPLv2
Apache James Yes Yes Yes Yes Yes Yes Yes Yes Yes ? Yes Yes No No Yes Yes No 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 No Yes Yes Yes ? Yes Yes No Yes No No GPLv3
CommuniGate Pro Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes Yes Proprietary (Free for up to 5 users)
Courier Mail Server Yes No Yes Yes Yes Yes Yes Yes Yes Yes ? Yes Yes No No maildir No GPLv3[2]
Cyrus IMAP Yes No Yes No Yes Yes Yes No Yes Yes Yes Yes No No Yes (indexes) Yes Yes 4-clause BSD[3]
Dovecot Yes[4] No[4] Yes[4] No Yes Yes Yes No Yes Yes No Yes No No Yes maildir, mbox, dbox No Mixed: MIT andLGPL 2.1[5]
Eudora Internet Mail Server No No Yes Yes Yes Yes ? No No ? No No No No No No Yes Proprietary
Exim Yes Yes (via Cygwin) Yes Yes Dovecot,UW IMAP Dovecot,UW IMAP Dovecot,UW IMAP Yes No Yes No Yes No No Yes Yes No GPLv2+[6]
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
Haraka Yes Yes Yes Yes No No No Yes No Yes No Yes No No Yes Yes Yes MIT
hMailServer No Yes No Yes Yes Yes Yes Yes Yes Yes No Yes Yes No Yes Yes No GNU AGPL
IBM Lotus Domino Yes Yes No Yes Yes Yes ? Yes Yes ? Yes Yes Yes Yes Yes No No Proprietary
IceWarp Mail Server Yes Yes No Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes No Proprietary
Ipswitch IMail Server No Yes No Yes Yes Yes ? Yes Yes ? No Yes Yes Yes No Yes No Proprietary
Kerio Connect Yes Yes Yes Yes Yes Yes Yes Yes Yes No 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 GPLv3
MagicMail Yes No No Yes Yes Yes ? Yes Yes ? No Yes Yes No Yes Yes Yes Proprietary
Mail server Linux/Unix Windows Mac OS SMTP POP3 IMAP IMAP IDLE SMTPover TLS POPoverTLS IPv6 NNTP SSL Webmail ActiveSync Database Filesystem Other License
Mail server Linux/Unix Windows Mac OS SMTP POP3 IMAP IMAP IDLE SMTPover TLS POPoverTLS IPv6 NNTP SSL Webmail ActiveSync Database Filesystem Other License
Mailenable No Yes No Yes Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes Yes No Proprietary
Mailsite 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
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[7][8] Yes Yes Yes (2007 sp1 onwards)[9] Yes Yes Yes Yes ESE only Yes (up to 2003 only)[10] Yes Proprietary
Momentum Yes No No Yes No No No Yes No Yes No Yes No No Yes Yes No Proprietary
NetMail Yes Yes No Yes Yes Yes ? Yes Yes ? ? Yes Yes No Yes No No Proprietary
Open-Xchange Yes No No Yes Yes Yes ? Yes Yes ? ? Yes Yes Yes Yes No No Proprietary/SaaS, with open-source parts[11]
OpenSMTPD Yes No Yes Yes No No No Yes No Yes No Yes No No possible through custom backends Yes No ISC
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 IBM Public License
qmail Yes No Yes Yes Yes Dovecot,UW IMAP Dovecot,UW IMAP No Dovecot,UW IMAP via Qsmtp ? No No No (cdb) Yes No Public domain
Qpopper Yes via Cygwin Yes No Yes No No No Yes ? No Yes No No No Yes Yes BSD-style, GPL-incompatible[12]
Sendmail Yes No Yes Yes Dovecot,UW IMAP Dovecot,UW IMAP Dovecot,UW IMAP Yes No Yes No Yes No No ? Yes ? Sendmail License
SparkEngine Yes Yes Yes Yes No No No Yes No ? No Yes No No Yes Yes Yes Proprietary
Synovel Collabsuite Yes No No Yes Yes Yes ? Yes Yes ? ? Yes Yes No Yes Yes ? Proprietary with OSS parts,Freeware and paid editions[13]
UW IMAP Yes Yes Yes No Yes Yes Yes No Yes ? No Yes WebPine No Yes (Indexes) Yes No Apache License 2.0[14]
WinGate No Yes No Yes Yes Yes Yes Yes Yes No No Yes Yes No No Yes No Proprietary
Zarafa Yes No No External[15] Yes Yes Yes External[15] Yes No No Yes Yes Yes Yes Yes No AGPLv3, free and paid editions[16]
Zimbra Yes No Yes Yes Yes Yes Yes Yes Yes No No Yes Yes Yes Yes Yes No ZPL and proprietary editions[17]
Mail server Linux/Unix Windows Mac OS X SMTP POP3 IMAP IMAP IDLE SMTPover TLS POPoverTLS IPv6 NNTP SSL Webmail ActiveSync Database Filesystem Other License
Server OS support Features Storage Users

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