Comparison of mail servers

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

Contents

Feature comparison

Mail server Linux/Unix Windows Mac OS X SMTP POP3 IMAP SMTP over TLS POP over TLS NNTP SSL Webmail Database Filesystem Other License
Server OS support Features Storage
Apache James Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes No Open Source/ASLv2
Atmail Yes No Yes Yes Yes Yes Yes Yes No Yes Yes Yes Yes No Proprietary
Axigen Yes Yes No Yes Yes Yes Yes Yes No Yes Yes No No Yes Proprietary
CommuniGate Pro Yes Yes Yes Yes Yes Yes Yes Yes No Yes Yes No Yes No Proprietary
Courier Mail Server Yes No Yes Yes Yes Yes Yes Yes  ? Yes Yes No maildir No Open Source
Cyrus IMAP Yes No Yes No Yes Yes No Yes Yes Yes No Yes (indexes) Yes Yes Open Source/BSD
Dovecot Yes[1] No[1] Yes[1] No Yes Yes No Yes No Yes No Yes maildir, mbox, dbox No Open Source/Mixed: MIT and LGPL 2.1[2]
Eudora Internet Mail Server No No Yes Yes Yes Yes No No No No No No No Yes Proprietary
Exim Yes via Cygwin Yes Yes No No Yes No No Yes No Yes Yes No Open Source/GPL
FirstClass 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 Yes Yes Yes Proprietary
GroupWise Yes Yes No Yes Yes Yes Yes Yes  ? Yes Yes Yes No No Proprietary
hMailServer No Yes No Yes Yes Yes V 5.0 V 5.0 No V 5.0 Yes Yes No No GNU GPL (V5.0 Proprietary)
IBM Lotus Domino Yes Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes No No Proprietary
IndiMail Yes No Yes Yes Yes Yes Yes Yes No Yes No Yes Yes No Open Source/GPLv3
Ipswitch IMail Server No Yes No Yes Yes Yes Yes Yes No Yes Yes No Yes No Proprietary
Kerio MailServer Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No Proprietary
Mailtraq No Yes No Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Proprietary
MDaemon No Yes No Yes Yes Yes Yes Yes No Yes Yes No Yes No Proprietary
Meldware Mail Server Yes Yes Yes Yes Yes Yes Yes Yes  ? Yes Yes Yes Yes No Open source/LGPL
Mercury Mail Transport System No Yes No Yes Yes Yes Yes Yes No Yes Yes No Yes No Proprietary/freeware
Microsoft Exchange Server No Yes No Yes Yes Yes Yes Yes Yes Yes Yes ESE only Yes (up to 2003 only) [3] No Proprietary
NetMail Yes Yes No Yes Yes Yes Yes Yes  ? Yes Yes Yes No No Proprietary
Open-Xchange Yes No No Yes Yes Yes Yes Yes  ? Yes Yes Yes No No Dual license (GPL)
Postfix Yes No Yes Yes No No Yes No No Yes No Yes Yes Yes Open source/IBM Public License
qmail Yes No Yes Yes Yes No No No  ? No No No Yes No Public domain
Qpopper Yes Yes Yes No Yes No No Yes No Yes No No Yes Yes BSD-style
Sendmail Yes No Yes Yes No No Yes No No No No ? Yes ? Open source/Sendmail License
SparkEngine Yes Yes Yes Yes No No Yes No No Yes No Yes Yes Yes Proprietary
Synovel CollabSuite Yes No No Yes Yes Yes Yes Yes  ? Yes Yes Yes Yes No Open Source/Proprietary
Sun Java System Messaging Server Yes No No Yes Yes Yes Yes Yes No Yes Yes Yes Yes No Proprietary
UW IMAP Yes Yes Yes No Yes Yes No Yes No Yes WebPine No Yes No Open Source/Apache license
WinGate No Yes No Yes Yes Yes Yes Yes  ? Yes Yes No Yes No Proprietary
Zarafa Yes No No Yes Yes Yes Yes Yes  ? Yes Yes Yes Yes No Proprietary
Zimbra Yes No Yes Yes Yes Yes Yes Yes  ? Yes Yes Yes Yes No Open Source/Proprietary
Mail server Server OS support Features Storage License
Linux/Unix Windows Mac OS X SMTP POP3 IMAP SMTP over TLS POP over TLS NNTP SSL Webmail Database Filesystem Other

Authentication

Mail server Login Authentication
SMTP AUTH POP before SMTP APOP Filesystem Database LDAP Other
Apache James Yes  ?  ?  ? Yes Yes  ?
Atmail Yes Yes Yes Yes Yes Yes PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, Active Directory, any LDAP-compatible source
Axigen Yes No Yes No No Yes GSSAPI, CRAM-MD5, DIGEST-MD5, APOP, CLRTXT, LOGIN, PLAIN, LDAP, Internal
CommuniGate Pro Yes Yes Yes Yes No Yes CLRTXT, CRAM-MD5, DIGEST-MD5, APOP, GSSAPI, NTLM, MSN, SESSIONID, External Authentication Plug-in
Courier Mail Server Yes Yes Yes Yes Yes Yes Managed by Courier authentication library which can use PAM, Userdb, , PostgreSQL(beta), MySQL, LDAP
Eudora Internet Mail Server Yes No Yes Yes No No CRAM-MD5, DIGEST-MD5, PLAIN, LOGIN
Exim Yes  ? Yes Yes Yes Yes Cyrus SASL, Dovecot SASL, CRAM-MD5, PLAIN, LOGIN, SPA
FirstClass Yes  ?  ? Yes Yes Yes
Gordano Messaging Suite Yes Yes Yes No Yes Yes PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, APOP, ODBC, Active Directory, NT Domain
GroupWise Yes Yes Yes Yes Yes Yes eDirectory, Any LDAPv3-compliant source
IndiMail Yes Yes No Yes Yes No CLRTXT, PLAIN, LOGIN, CRAM-MD5, APOP, Checkpassword, authvchkpw
Ipswitch IMail Server Yes No Yes Yes Yes Yes Active Directory, Windows authentication, CRAM-MD5, PLAIN, LOGIN
Kerio MailServer Yes Yes Yes Yes No Yes Active Directory, Apple Open Directory, ActiveSync, Pluggable Authentication Modules
Mailtraq Yes Yes Yes Yes Yes Yes NT Domain, Active Directory, Local Directory
MDaemon Yes Yes Yes No Yes Yes Active Directory, PLAIN, CRAM-MD5, LOGIN
Meldware Mail Server Yes No Yes Yes Yes Yes  ?
Mercury Mail Transport System Yes Yes Yes Yes No  ? Internal, LOGIN, PLAIN, CRAM-MD5, Netware, LDAP?, partial NT Domain
Microsoft Exchange Server Yes  ? Yes No No Yes Active Directory
NetMail Yes Yes Yes Yes Yes Yes eDirectory, LDAP
Postfix Yes No No Yes Yes Yes  ?
Qpopper No Yes Yes Yes Yes Yes Pluggable Authentication Modules,GSSAPI, CRAM-MD5, DIGEST-MD5, APOP, PLAIN, LDAP, CMU SASL library, Kerberos
WinGate Yes Yes Yes Yes Yes No NT Domain, Active Directory, CRAM-MD5, SASL PLAIN, SASL LOGIN
Zarafa Yes Yes  ? Yes Yes Yes Internal, Active Directory, any LDAP-compatible source, Unix
Zimbra Yes No Yes Yes Yes Yes Internal, LDAP, Open LDAP, Active Directory

Antispam Features

Mail Server DNSBL SURBL Spamtraps Greylisting SPF Tarpit Bayesian filters Regular expressions Embedded Antivirus Embedded Antispam
Apache James  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
Atmail Yes Yes No Yes Yes No Yes Yes Yes ClamAV  ?
Axigen Yes No No Yes Yes No Yes Yes Yes Commtouch Yes SpamAssassin
CommuniGate Pro Yes Yes Yes No Yes Yes Template:Optional Yes Template:Optional Template:Optional
Courier Mail Server Yes  ? Yes Yes[4] Yes Yes Yes[4] Yes[4] Yes Clamav Yes[4]
Cyrus IMAP No No No No No No No No No No
Dovecot  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
Eudora Internet Mail Server Yes  ? Yes Yes  ?  ?  ?  ?  ?  ?
Exim Yes Yes Yes Yes Yes Yes Template:Optional with spamassasin etc Yes Template:Optional any Template:Optional any
FirstClass Yes Yes No  ? Yes Yes Yes Yes Yes Symantec  ?
Gordano Messaging Suite Yes Yes Yes Yes Yes Yes Yes Yes Yes Commtouch, Authentium Yes Commtouch
GroupWise  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
hMailServer Yes Yes No Yes Yes No No Yes Yes ClamAV  ?
IBM Lotus Domino Yes[5]  ?  ?  ? No[6]  ?  ?  ?  ?  ?
IndiMail Yes No No Yes Yes Yes Yes Yes Yes ClamAV Yes Bogofilter
Ipswitch IMail Server Yes Yes No No Yes No Yes Yes Yes Symantec, BitDefender Yes Commtouch
Kerio MailServer Yes Yes  ?  ? Yes  ? Yes  ? Template:Optional McAfee Yes
Mailtraq  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
MDaemon Yes Yes Yes Yes Yes Yes Yes Yes Template:Optional Kaspersky Labs Yes
Meldware Mail Server  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
Mercury Mail Transport System Yes  ?  ? Yes (GreyWall extension)  ?  ? Yes (SpamHalter extension)  ? Yes (ClamWall extension)  ?
Microsoft Exchange Server Yes (2003 & later)  ?  ? Yes Yes Yes (2007 & later)  ?  ?  ?  ?
NetMail  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
Postfix Yes  ?  ? Yes  ?  ?  ? Yes  ?  ?
qmail  ?  ?  ? Yes  ?  ?  ?  ?  ?  ?
Sendmail  ?  ?  ? Yes  ?  ?  ?  ?  ?  ?
SparkEngine  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
Sun Java System Messaging Server  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
UW IMAP  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
WinGate  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
Zarafa  ?  ?  ?  ?  ?  ?  ?  ?  ?  ?
Zimbra Yes  ?  ?  ?  ?  ?  ?  ? Yes ClamAV Yes SpamAssassin
Mail Server DNSBL SURBL Spamtraps Greylisting SPF Tarpit Bayesian filters Regular expressions Embedded Antivirus Embedded Antispam

See also

Notes and references

  1. 1.0 1.1 1.2 Dovecot Operating System Compatibility. Retrieved on 2008-09-03.
  2. Dovecot licensing information: COPYING. Retrieved on 2008-09-03.
  3. Exchange Installable File System (ExIFS)
  4. 4.0 4.1 4.2 4.3 with Courier-pythonfilter filtering framework
  5. http://www-01.ibm.com/support/docview.wss?uid=swg21102611
  6. http://www-01.ibm.com/support/docview.wss?rs=463&context=SSKTMJ&dc=DB520&uid=swg21227751&loc=en_US&cs=UTF-8&lang=en&rss=ct463lotus
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