| Comparison of mail serversThis is a comparison of mail servers: mail transfer agents, mail delivery agents, and other computer software which provide e-mail services. Note Linux based mail servers are built using a number of components due to the fact a Linux environment is by default a multi-user operating system. When you deploy a Linux server it already has internal mail. To allow this server to send external emails you need a MTA (Mail Transfer Agent) such as sendmail, postfix and exim. If you wish users to not have direct access to the server and have to physical login to read their emails, then you need to give those users access to the emails received by the MTA, then you install an additional service like Dovecot or UW IMAP which provide the POP and IMAP services for your mail server. Feature comparison00000 ! | 00000 !Server OS support | 00000 !Features | 00000 !Storage | 00000 ! |
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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 | ? | 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[1] | Cyrus IMAP | Yes | No | Yes | No | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | No | No | Yes (indexes) | Yes | Yes | 4-clause BSD[2] | 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 | GPLv2[3] | Digital Integration iMail5 | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | ? | No | Yes | Yes | No | Yes | Yes | Yes | Proprietary | Dovecot | Yes[4] | No[4] | Yes[4] | No | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | No | No | Yes | maildir, mbox, dbox | No | Mixed: MIT and LGPL 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 | 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 |
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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 | 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 | GPLv3 | MagicMail | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | ? | No | Yes | Yes | No | Yes | Yes | Yes | 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 | masqmail | Yes | No | Yes | Yes | No | No | No | Yes | No | Yes | No | Yes | No | No | No | Yes | Yes | GPL | MDaemon Mail Server | No | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes [Requires one time fee] [7] | Yes [Requires one time fee] | 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[8][9] | Yes | Yes | Yes (2007 sp1 onwards)[10] | Yes | Yes | Yes | Yes | ESE only | Yes (up to 2003 only)[11] | Yes | 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 | 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 | Proprietary/SaaS, with open-source parts[12] | 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 |
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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[13] | 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 | SurgeMail | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | Yes | Yes | No | Yes | Yes | Yes | Proprietary (free for up to 5 users) | Synovel Collabsuite | Yes | No | No | Yes | Yes | Yes | ? | Yes | Yes | ? | ? | Yes | Yes | No | Yes | Yes | ? | Proprietary with OSS parts, Freeware and paid editions[14] | UW IMAP | Yes | Yes | Yes | No | Yes | Yes | Yes | No | Yes | ? | No | Yes | WebPine | No | Yes (Indexes) | Yes | No | Apache License 2.0[15] | 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 | Freeware with support option | Zarafa | Yes | No | No | External[16] | Yes | Yes | Yes | External[16] | Yes | No | No | Yes | Yes | Yes | Yes | Yes | No | AGPLv3, free and paid editions[17] | Zimbra | Yes | No | Yes | Yes | Yes | Yes | Yes | Yes | Yes | No | No | Yes | Yes | Yes | Yes | Yes | No | ZPL and proprietary editions[18] | 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 |
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zzzzz ! | zzzzz !Server OS support | zzzzz !Features | zzzzz !Storage | zzzzz ! |
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Authentication|
agorum core | Yes | No | No | No | Yes | Yes | PLAIN, LOGIN, CRAM-MD5, NTLM | Apache James | Yes | ? | ? | ? | Yes | Yes | PLAIN, LOGIN | 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 | Active Directory (LDAP), CLRTXT, CRAM-MD5, DIGEST-MD5, APOP, GSSAPI, NTLM, MSN, SESSIONID, External Authentication Plug-in. Also supports X.509 PKI auth via STARTTLS/SSL | 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 | Yes | 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 | Yes | Yes | Yes | Yes | Yes | Not an SMTP server, but offers SASL to MTAs. http://wiki.dovecot.org/DovecotFeatur es http://wiki.dovecot.org/Authenticatio n. POP-before-SMTP via DRAC plugin. PAM, MySQL, PostgreSQL, SQLite, LDAP, Active Directory(LDAP), Kerberos 5, proxied IMAP auth, getpwent, shadow, SIA, BSDauth, Vpopmail. APOP and SASL mechanisms: ANONYMOUS, PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, SCRAM-SHA1, EXTERNAL, GSSAPI, NTLM, OTP, SKEY, RPA. | 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 | JMail | Yes | No | Yes | No | No | No | CRAM-MD5, PLAIN, LOGIN, APOP, HTTP DIGEST. Authentication through a JID system | Kolab | Yes | Yes | Yes | Yes | Yes | Yes | Kolab employs Cyrus and Postfix and thus supports all Cyrus SASL authentication methods and X.509 PKI auth via STARTTLS and EXTERNAL. | 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 | 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 | 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 Server | Yes | Yes | Yes | Yes | Yes | Yes | Plain, Login, CRAM-MD5, Digest-MD5, Certificate | OpenSMTPD | Yes | No | No | Yes | Yes | Yes | By default PLAIN and LOGIN over SSL only, Certificates, bsd_auth and PAM. Supports adding new authentication mechanisms through custom backends. | 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 | with patch | with vpopmail | Yes | Yes | Yes | Yes | Works with any checkpassword utility. The original supports only LOGIN and PLAIN. Alternate checkpassword utilities support authentication against PAM, LDAP, and databases. | 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 |
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Antispam Features See also Notes and references- ^ See COPYING file in the distribution
- ^ https://cyrusimap.org/mediawiki/index .php/Downloads#Licensing
- ^ http://git.dbmail.eu/paul/dbmail/tree /README
- ^ a b c Dovecot Operating System Compatibility. Retrieved on 2008-09-03.
- ^ "Dovecot licensing information: COPYING". http://www.dovecot.org/doc/COPYING. Retrieved 2008-09-03.
- ^ See NOTICE file in the distribution
- ^ ActiveSync for MDaemon
- ^ http://technet.microsoft.com/en-us/li brary/cc540463(EXCHG.80).aspx
- ^ http://technet.microsoft.com/en-us/li brary/ff848256.aspx
- ^ http://technet.microsoft.com/en-us/li brary/bb629624(EXCHG.80).aspx
- ^ Exchange Installable File System (ExIFS)
- ^ http://www.open-xchange.com/misc/lice nses/
- ^ Contains jurisdiction selection and IBM Public License-style indemnification clause.
- ^ http://www.synovel.com/collab/edition s
- ^ UW IMAP Server Documentation
- ^ a b c d e f g h i j Zarafa Collaboration Platform architecture diagram. Retrieved on 2011-12-10.
- ^ http://www.zarafa.com/content/scope-a nd-benefits
- ^ [1]
- ^ via Kaspersky anti-spam add-on
- ^ 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
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