Comparison of mail servers

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

Contents

1 Feature comparison

2 Authentication

3 Antispam Features

4 See also

5 Notes and references

Feature comparison

00000 ! 00000 !Server OS support 00000 !Features 00000 !Storage 00000 !

Mail server Linux/Unix Windows Mac OS SMTP POP3 IMAP 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 ? No Yes Yes Yes Yes Yes No Proprietary (Free 5 user)

Axigen Yes Yes No Yes Yes Yes Yes Yes ? No Yes Yes Yes No No Yes Proprietary (free version: email 100 users / calender 5 users)

Citadel Yes No 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 No Yes Yes Yes Yes Yes Yes Proprietary

Courier Mail Server Yes No Yes Yes Yes Yes Yes Yes Yes ? Yes Yes No No maildir No Open Source

Cyrus IMAP Yes No Yes 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 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 ? No Yes Yes No Yes Yes Yes Proprietary

Dovecot Yes^[1] No^[1] Yes^[1] No Yes Yes No Yes Yes No Yes No 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 No Yes Proprietary

Exim Yes via Cygwin Yes Yes No No 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

hMailServer No Yes No 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

Kerio Connect Yes Yes Yes Yes Yes Yes Yes Yes ? Yes Yes Yes Yes Yes Yes No Proprietary

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 No Yes Yes Yes Proprietary

MDaemon Mail Server No Yes No Yes Yes Yes Yes Yes ? No Yes Yes No No 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 (2007 sp1 onwards)^[3] Yes Yes Yes Yes ESE only Yes (up to 2003 only)^[4] No Proprietary

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

Open-Xchange Yes No No Yes Yes Yes Yes Yes ? ? Yes Yes Yes Yes No No Dual license (GPL)

Oracle Communications Messaging Exchange Server Yes No No Yes Yes Yes Yes Yes ? No Yes Yes No Yes Yes No Proprietary

Postfix Yes No Yes Yes No No 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 No No No Yes No Public domain

Qpopper Yes via Cygwin Yes No Yes No No Yes ? No Yes No No No Yes Yes BSD-style

Sendmail Yes No Yes Yes No No Yes No Yes No Yes No No ? Yes ? Open source/Sendmail License

SparkEngine Yes Yes Yes Yes No No Yes No ? No Yes No No Yes Yes Yes Proprietary

SurgeMail 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 No Yes ? No Yes WebPine No Yes (Indexes) Yes No Open Source/Apache license

WinGate No Yes No Yes Yes Yes Yes Yes ? ? Yes Yes No No Yes No Proprietary

Zarafa Yes No No No Yes Yes No Yes ? ? Yes Yes Yes Yes Yes No Open Source/Proprietary

Zimbra Yes No 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 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 !

Authentication

Mail server SMTP AUTH POP before SMTP APOP Filesystem Database LDAP Other

agorum core Yes No No No Yes Yes PLAIN, LOGIN, CRAM-MD5, NTLM

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 Yes 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, and EXTERNAL.

Cyrus IMAP No Yes Yes Yes Yes Yes Supports all Cyrus SASL authentication methods. Also supports X.509 PKI auth via STARTTLS and EXTERNAL.

Cyrus SASL Library No No Yes Yes Yes Yes Berkeley DB, GDBM, or NDBM (sasldb), PAM, MySQL, PostgreSQL, SQLite, LDAP, Active Directory(LDAP), DCE, Kerberos 4 and 5, proxied IMAP auth, getpwent, shadow, SIA, Courier Authdaemon, httpform, APOP and SASL mechanisms: ANONYMOUS, CRAM-MD5, DIGEST-MD5, EXTERNAL, GSSAPI, LOGIN, NTLM, OTP, PASSDSS, PLAIN, SRP

Digital Integration iMail5 Yes No Yes No No No

Dovecot No No Yes Yes Yes Yes Not an SMTP server, but offers SASL to MTAs. http://wiki.dovecot.org/DovecotFeatures http://wiki.dovecot.org/Authentication

Eudora Internet Mail Server Yes No Yes Yes No No CRAM-MD5, DIGEST-MD5, PLAIN, LOGIN

Exim Yes 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

Hexamail Server Yes Yes Yes Yes No Yes CLRTXT, CRAM-MD5, DIGEST-MD5, APOP, GSSAPI, NTLM, MSN, SESSIONID

IndiMail Yes Yes No Yes Yes Yes CLRTXT, PLAIN, LOGIN, CRAM-MD5, CRAM-SHA1, CRAM-RIPEMD, DIGEST-MD5, APOP, Checkpassword, authindi, authldap, Pluggable Authentication Modules, Name Service Switch

Ipswitch IMail Server Yes No Yes Yes Yes Yes Active Directory, Windows authentication, CRAM-MD5, PLAIN, LOGIN

Kerio Connect Yes Yes Yes Yes No Yes Active Directory, Apple Open Directory, ActiveSync, Pluggable Authentication Modules

MagicMail Yes No No Yes Yes No ?

MailSite Fusion Yes No Yes Yes Yes Yes NT Domain, Active Directory, PLAIN, LOGIN, NTLM, SCRAM-MD5, CRAM-MD5

Mailtraq Yes Yes Yes Yes Yes Yes NT Domain, Active Directory, Local Directory

MDaemon Mail Server 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, PLAIN, NTLM

Mirapoint Yes Yes Yes Yes Yes Yes Plaintext, LDAP, NTLM, APOP, Kerberos_v4, Kerberos_v5, Radius, Sessionid

NetMail Yes Yes Yes Yes Yes Yes eDirectory, LDAP

Oracle Communications Messaging Exchange Server Yes Yes Yes Yes Yes Yes Plain, Login, CRAM-MD5, Digest-MD5, Certificate

Postfix Yes No No Yes Yes Yes Supports all Cyrus SASL authentication methods except for APOP.

Qpopper No Yes Yes Yes Yes Yes Pluggable Authentication Modules,GSSAPI, CRAM-MD5, DIGEST-MD5, APOP, PLAIN, LDAP, CMU SASL library, Kerberos

qmail ? ? ? ? ? ? ?

Sendmail Yes Yes No Yes Yes Yes Supports all Cyrus SASL authentication methods except for APOP. Also supports X.509 PKI auth via STARTTLS and EXTERNAL.

SurgeMail Yes Yes Yes Yes Yes Yes Internal, LDAP, PAM, MYSQL, ODBC, Unix Password, Windows Domain or external protocol

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

Mail server SMTP AUTH POP before SMTP APOP Filesystem Database LDAP Other

Antispam Features

Mail Server DNSBL SURBL Spamtraps Greylisting SPF Tarpit Bayesian filters Regular expressions Embedded Antivirus Embedded Antispam

agorum core No No No No No No No Yes No No

Apache James ? ? ? ? ? ? Yes ? ? ?

Atmail Yes Yes Yes Yes Yes Yes Yes Yes Yes ClamAV Yes SpamAssassin and Exim ACLs

Axigen Yes No No Yes Yes No Yes, in SpamAssassin Yes Yes Commtouch Yes SpamAssassin

Citadel Yes Yes No No Optional (via SpamAssassin) No Optional (via SpamAssassin) No Optional (ClamAV) Optional (SpamAssassin)

CommuniGate Pro Yes Yes Yes No Yes Yes Optional Yes Optional Optional

Courier Mail Server Yes ? Yes Yes^[5] Yes Yes Yes^[5] Yes^[5] Yes Clamav Yes^[5]

Digital Integration iMail5 Yes No No Yes No No No Optional (GWAVA) Optional (GWAVA) Proprietary, Optional (GWAVA)

Dovecot ? ? ? ? ? ? ? ? ? ?

Eudora Internet Mail Server Yes ? Yes Yes ? ? ? ? ? ?

Exim Yes Yes Yes Yes Yes Yes Optional with spamassassin etc. Yes Optional any 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 Yes ? ? ? ? ? ? ? ? ?

Hexamail Server Yes Yes Yes Yes Yes Yes Yes Yes Yes BitDefender Yes

hMailServer Yes Yes No Yes Yes No No Yes Yes ClamAV Yes SpamAssassin

IBM Lotus Domino Yes^[6] ? ? ? No^[7] ? ? ? ? ?

IndiMail Yes Yes 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 Connect Yes Yes ? No Yes Yes Yes ? Optional Sophos + optional secondary (dual) Yes

MagicMail Yes No Yes No ? ? No Yes Yes Yes

MailSite Fusion Yes Yes Yes Yes Yes No Yes Yes Yes Yes

Mailtraq ? ? ? ? ? ? ? ? ? ?

MDaemon Mail Server Yes Yes Yes Yes Yes Yes Yes Yes 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 (2003 & later) ? ? ? ?

Mirapoint Yes No Yes Yes Yes Yes Yes Yes Yes Commtouch, Sophos, F-Secure Yes Commtouch, Sophos, SPamAssassin

NetMail ? ? ? ? ? ? ? ? ? ?

Oracle Communications Messaging Exchange Server Yes Yes Yes Yes Yes Yes Optional with spamassassin etc. Yes Optional any Optional any

Postfix Yes ? ? Yes Yes ? Optional with spamassassin etc. Yes Optional (via content filter interface) Optional (via content filter interface)

qmail ? ? ? Yes ? ? No ? No No

Sendmail ? ? ? Yes ? ? ? ? ? ?

SparkEngine ? ? ? ? ? ? ? ? ? ?

SurgeMail Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes

Synovel Collabsuite Yes Yes Yes Yes Yes ? Yes Yes YesClamAV Yes SpamAssassin

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

List of mail servers

Comparison of e-mail clients

Notes and references

^ ^a ^b ^c Dovecot Operating System Compatibility. Retrieved on 2008-09-03.

^ Dovecot licensing information: COPYING. Retrieved on 2008-09-03.

^ http://technet.microsoft.com/en-us/library/bb629624(EXCHG.80).aspx

^ Exchange Installable File System (ExIFS)

^ ^a ^b ^c ^d with Courier-pythonfilter filtering framework

^ http://www-01.ibm.com/support/docview.wss?uid=swg21102611

^ 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

Categories:
Email
Software comparisons
Message transfer agents

00000 !	00000 !Server OS support	00000 !Features	00000 !Storage	00000 !
Mail server	Linux/Unix	Windows	Mac OS	SMTP	POP3	IMAP	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	?	No	Yes	Yes	Yes	Yes	Yes	No	Proprietary (Free 5 user)
Axigen	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	?	No	Yes	Yes	Yes	No	No	Yes	Proprietary (free version: email 100 users / calender 5 users)
Citadel	Yes	No	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	No	Yes	Yes	Yes	Yes	Yes	Yes	Proprietary
Courier Mail Server	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	No	No	maildir	No	Open Source
Cyrus IMAP	Yes	No	Yes	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	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	?	No	Yes	Yes	No	Yes	Yes	Yes	Proprietary
Dovecot	Yes^[1]	No^[1]	Yes^[1]	No	Yes	Yes	No	Yes	Yes	No	Yes	No	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	No	Yes	Proprietary
Exim	Yes	via Cygwin	Yes	Yes	No	No	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
hMailServer	No	Yes	No	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
Kerio Connect	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	Yes	No	Proprietary
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	No	Yes	Yes	Yes	Proprietary
MDaemon Mail Server	No	Yes	No	Yes	Yes	Yes	Yes	Yes	?	No	Yes	Yes	No	No	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 (2007 sp1 onwards)^[3]	Yes	Yes	Yes	Yes	ESE only	Yes (up to 2003 only)^[4]	No	Proprietary
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
Open-Xchange	Yes	No	No	Yes	Yes	Yes	Yes	Yes	?	?	Yes	Yes	Yes	Yes	No	No	Dual license (GPL)
Oracle Communications Messaging Exchange Server	Yes	No	No	Yes	Yes	Yes	Yes	Yes	?	No	Yes	Yes	No	Yes	Yes	No	Proprietary
Postfix	Yes	No	Yes	Yes	No	No	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	No	No	No	Yes	No	Public domain
Qpopper	Yes	via Cygwin	Yes	No	Yes	No	No	Yes	?	No	Yes	No	No	No	Yes	Yes	BSD-style
Sendmail	Yes	No	Yes	Yes	No	No	Yes	No	Yes	No	Yes	No	No	?	Yes	?	Open source/Sendmail License
SparkEngine	Yes	Yes	Yes	Yes	No	No	Yes	No	?	No	Yes	No	No	Yes	Yes	Yes	Proprietary
SurgeMail	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	No	Yes	?	No	Yes	WebPine	No	Yes (Indexes)	Yes	No	Open Source/Apache license
WinGate	No	Yes	No	Yes	Yes	Yes	Yes	Yes	?	?	Yes	Yes	No	No	Yes	No	Proprietary
Zarafa	Yes	No	No	No	Yes	Yes	No	Yes	?	?	Yes	Yes	Yes	Yes	Yes	No	Open Source/Proprietary
Zimbra	Yes	No	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	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 !

Mail server	SMTP AUTH	POP before SMTP	APOP	Filesystem	Database	LDAP	Other
agorum core	Yes	No	No	No	Yes	Yes	PLAIN, LOGIN, CRAM-MD5, NTLM
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	Yes	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, and EXTERNAL.
Cyrus IMAP	No	Yes	Yes	Yes	Yes	Yes	Supports all Cyrus SASL authentication methods. Also supports X.509 PKI auth via STARTTLS and EXTERNAL.
Cyrus SASL Library	No	No	Yes	Yes	Yes	Yes	Berkeley DB, GDBM, or NDBM (sasldb), PAM, MySQL, PostgreSQL, SQLite, LDAP, Active Directory(LDAP), DCE, Kerberos 4 and 5, proxied IMAP auth, getpwent, shadow, SIA, Courier Authdaemon, httpform, APOP and SASL mechanisms: ANONYMOUS, CRAM-MD5, DIGEST-MD5, EXTERNAL, GSSAPI, LOGIN, NTLM, OTP, PASSDSS, PLAIN, SRP
Digital Integration iMail5	Yes	No	Yes	No	No	No
Dovecot	No	No	Yes	Yes	Yes	Yes	Not an SMTP server, but offers SASL to MTAs. http://wiki.dovecot.org/DovecotFeatures http://wiki.dovecot.org/Authentication
Eudora Internet Mail Server	Yes	No	Yes	Yes	No	No	CRAM-MD5, DIGEST-MD5, PLAIN, LOGIN
Exim	Yes	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
Hexamail Server	Yes	Yes	Yes	Yes	No	Yes	CLRTXT, CRAM-MD5, DIGEST-MD5, APOP, GSSAPI, NTLM, MSN, SESSIONID
IndiMail	Yes	Yes	No	Yes	Yes	Yes	CLRTXT, PLAIN, LOGIN, CRAM-MD5, CRAM-SHA1, CRAM-RIPEMD, DIGEST-MD5, APOP, Checkpassword, authindi, authldap, Pluggable Authentication Modules, Name Service Switch
Ipswitch IMail Server	Yes	No	Yes	Yes	Yes	Yes	Active Directory, Windows authentication, CRAM-MD5, PLAIN, LOGIN
Kerio Connect	Yes	Yes	Yes	Yes	No	Yes	Active Directory, Apple Open Directory, ActiveSync, Pluggable Authentication Modules
MagicMail	Yes	No	No	Yes	Yes	No	?
MailSite Fusion	Yes	No	Yes	Yes	Yes	Yes	NT Domain, Active Directory, PLAIN, LOGIN, NTLM, SCRAM-MD5, CRAM-MD5
Mailtraq	Yes	Yes	Yes	Yes	Yes	Yes	NT Domain, Active Directory, Local Directory
MDaemon Mail Server	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, PLAIN, NTLM
Mirapoint	Yes	Yes	Yes	Yes	Yes	Yes	Plaintext, LDAP, NTLM, APOP, Kerberos_v4, Kerberos_v5, Radius, Sessionid
NetMail	Yes	Yes	Yes	Yes	Yes	Yes	eDirectory, LDAP
Oracle Communications Messaging Exchange Server	Yes	Yes	Yes	Yes	Yes	Yes	Plain, Login, CRAM-MD5, Digest-MD5, Certificate
Postfix	Yes	No	No	Yes	Yes	Yes	Supports all Cyrus SASL authentication methods except for APOP.
Qpopper	No	Yes	Yes	Yes	Yes	Yes	Pluggable Authentication Modules,GSSAPI, CRAM-MD5, DIGEST-MD5, APOP, PLAIN, LDAP, CMU SASL library, Kerberos
qmail	?	?	?	?	?	?	?
Sendmail	Yes	Yes	No	Yes	Yes	Yes	Supports all Cyrus SASL authentication methods except for APOP. Also supports X.509 PKI auth via STARTTLS and EXTERNAL.
SurgeMail	Yes	Yes	Yes	Yes	Yes	Yes	Internal, LDAP, PAM, MYSQL, ODBC, Unix Password, Windows Domain or external protocol
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
Mail server	SMTP AUTH	POP before SMTP	APOP	Filesystem	Database	LDAP	Other

Mail Server	DNSBL	SURBL	Spamtraps	Greylisting	SPF	Tarpit	Bayesian filters	Regular expressions	Embedded Antivirus	Embedded Antispam
agorum core	No	No	No	No	No	No	No	Yes	No	No
Apache James	?	?	?	?	?	?	Yes	?	?	?
Atmail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes ClamAV	Yes SpamAssassin and Exim ACLs
Axigen	Yes	No	No	Yes	Yes	No	Yes, in SpamAssassin	Yes	Yes Commtouch	Yes SpamAssassin
Citadel	Yes	Yes	No	No	Optional (via SpamAssassin)	No	Optional (via SpamAssassin)	No	Optional (ClamAV)	Optional (SpamAssassin)
CommuniGate Pro	Yes	Yes	Yes	No	Yes	Yes	Optional	Yes	Optional	Optional
Courier Mail Server	Yes	?	Yes	Yes^[5]	Yes	Yes	Yes^[5]	Yes^[5]	Yes Clamav	Yes^[5]
Digital Integration iMail5	Yes	No	No	Yes	No	No	No	Optional (GWAVA)	Optional (GWAVA)	Proprietary, Optional (GWAVA)
Dovecot	?	?	?	?	?	?	?	?	?	?
Eudora Internet Mail Server	Yes	?	Yes	Yes	?	?	?	?	?	?
Exim	Yes	Yes	Yes	Yes	Yes	Yes	Optional with spamassassin etc.	Yes	Optional any	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	Yes	?	?	?	?	?	?	?	?	?
Hexamail Server	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes BitDefender	Yes
hMailServer	Yes	Yes	No	Yes	Yes	No	No	Yes	Yes ClamAV	Yes SpamAssassin
IBM Lotus Domino	Yes^[6]	?	?	?	No^[7]	?	?	?	?	?
IndiMail	Yes	Yes	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 Connect	Yes	Yes	?	No	Yes	Yes	Yes	?	Optional Sophos + optional secondary (dual)	Yes
MagicMail	Yes	No	Yes	No	?	?	No	Yes	Yes	Yes
MailSite Fusion	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes
Mailtraq	?	?	?	?	?	?	?	?	?	?
MDaemon Mail Server	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	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 (2003 & later)	?	?	?	?
Mirapoint	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes Commtouch, Sophos, F-Secure	Yes Commtouch, Sophos, SPamAssassin
NetMail	?	?	?	?	?	?	?	?	?	?
Oracle Communications Messaging Exchange Server	Yes	Yes	Yes	Yes	Yes	Yes	Optional with spamassassin etc.	Yes	Optional any	Optional any
Postfix	Yes	?	?	Yes	Yes	?	Optional with spamassassin etc.	Yes	Optional (via content filter interface)	Optional (via content filter interface)
qmail	?	?	?	Yes	?	?	No	?	No	No
Sendmail	?	?	?	Yes	?	?	?	?	?	?
SparkEngine	?	?	?	?	?	?	?	?	?	?
SurgeMail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Synovel Collabsuite	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	YesClamAV	Yes SpamAssassin
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

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Comparison of mail servers

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Feature comparison

Authentication

Antispam Features

See also

Notes and references

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Comparison of mail servers

Contents

Feature comparison

Authentication

Antispam Features

See also

Notes and references

Look at other dictionaries:

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