This is a list of mail servers: mail transfer agents, mail delivery agent

Mail delivery agent

A mail delivery agent or message delivery agent is a computer software component that is responsible for the delivery of e-mail messages to a local recipient's mailbox...

s, and other computer software

Computer software

Computer software, or just software, is a collection of computer programs and related data that provide the instructions for telling a computer what to do and how to do it....

 which provide e-mail

E-mail

Electronic mail, commonly known as email or e-mail, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author and the recipient both be online at the...

 services.

Product statistics

According to one survey, sendmail

Sendmail

Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and -delivery methods, including the Simple Mail Transfer Protocol used for email transport over the Internet....

, Microsoft Exchange Server

Microsoft Exchange Server

Microsoft Exchange Server is the server side of a client–server, collaborative application product developed by Microsoft. It is part of the Microsoft Servers line of server products and is used by enterprises using Microsoft infrastructure products...

, Postfix

Postfix (software)

In computing, Postfix is a free and open-source mail transfer agent that routes and delivers electronic mail. It is intended as a fast, easier-to-administer, and secure alternative to the widely-used Sendmail MTA....

, and Exim

Exim

Exim is a mail transfer agent used on Unix-like operating systems. Exim is free software distributed under the terms of the GNU General Public License, and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail....

 together control over 85% of market share for SMTP service.

Another survey suggests a more balanced distribution, though it included hosted e-mail services such as Postini

Postini

Postini is an e-mail and Web security and archiving service owned by Google since 2007. It provides cloud computing services for filtering e-mail spam and malware , offers optional e-mail archiving, and protects client networks from web-borne malware.-History:Postini was a startup company founded...

.

These surveys are rather difficult to produce, hence it is no surprise if they disagree.

SMTP

Simple Mail Transfer Protocol

Simple Mail Transfer Protocol is an Internet standard for electronic mail transmission across Internet Protocol networks. SMTP was first defined by RFC 821 , and last updated by RFC 5321 which includes the extended SMTP additions, and is the protocol in widespread use today...

 

• AfterLogic WebMail Lite
  AfterLogic WebMail Lite
  AfterLogic WebMail Lite is a free POP3, IMAP and SMTP webmail script with Ajax interface. AfterLogic WebMail Lite is available for both ASP.NET and PHP platforms...
  
   Open Source SMTP server for windows.
• agorum core
  Agorum core
  agorum core is a free Open-Source Enterprise Content Management system by agorum Software GmbH from Germany. One of the main features is the Document-Network-Share. With that the documents within the ECM are shown as a normal network share...
  
   Open Source Document Management/Enterprise Content Management
• Atmail
• Axigen
  AXIGEN
  Axigen, marketed as AXIGEN, is a mail server with groupware and collaboration functionalities. It supports SMTP/ESMTP, IMAP, POP3 and webmail services, and has an integrated mailing list server...
  
  
• Bongo
• Citadel
  Citadel/UX
  Citadel/UX is a collaboration suite that is descended from the Citadel family of programs which became popular in the 1980s and 1990s as a bulletin board system platform. It is designed to run on open source operating systems such as Linux or BSD...
  
  
• ContactOffice
  ContactOffice
  ContactOffice is a web application accessible with a html browser , developed by ContactOffice Group. It is a virtual office consisting of a set of interrelated tools ....
  
  
• CommuniGate Pro
  CommuniGate Pro
  CommuniGate Pro is the a server software product that provides IP based, Unified Communications services, including e-mail, Voice over IP, IM and GroupWare capabilities....
  
  
• Courier
  Courier Mail Server
  The Courier mail server is a mail transfer agent server that provides ESMTP, IMAP, POP3, SMAP, webmail, and mailing list services with individual components. It is best known for its IMAP server component....
  
  
• Eudora Internet Mail Server
  Eudora Internet Mail Server
  Eudora Internet Mail Server is a POP3, IMAP, and SMTP server for Mac OS.-History:In 1993 Glenn Anderson started development on what was then called MailShare, which was available as freeware. In 1995 MailShare was purchased by Apple Computer and renamed to Apple Internet Mail Server. Version 1.0...
  
  
• Exim
  Exim
  Exim is a mail transfer agent used on Unix-like operating systems. Exim is free software distributed under the terms of the GNU General Public License, and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail....
  
  
• FirstClass
  FirstClass
  FirstClass is a client/server groupware, email, online conferencing, voice/fax services, and bulletin-board system for Windows, Macintosh, and Linux...
  
  
• fmaild
  Fmaild
  fmaild is a mail forwarding daemon or forwarding MTA. It accepts SMTP connections and forwards them to another MTA according to an aliases file....
  
  
• Gammadyne Mailer
  Gammadyne Mailer
  Gammadyne Mailer is a Windows application that automates email operations. It can send personalized email to a mailing list, as well as process incoming email in an automated fashion.Gammadyne Mailer is Gammadyne Corporation's flagship product.-Author:...
  
  
• Gordano Messaging Suite
  Gordano Messaging Suite
  Gordano Messaging Suite is a commercial mail and groupware server developed by Gordano Ltd. It runs on Windows, Linux, Solaris, and AIX. Originally called NTMail which was the first commercially available mail for the Windows platform, the products were rebranded to the Gordano Messaging Suite in...
  
  
• HMailServer
  HMailServer
  hMailServer is a free email server for Windows created by Martin Knafve. It runs as a Windows service and includes administration tools for management and backup. It has support for IMAP, POP3, and SMTP email protocols. It uses database engines to store configuration and index data but the actual...
  
  
• IBM
  IBM
  International Business Machines Corporation or IBM is an American multinational technology and consulting corporation headquartered in Armonk, New York, United States. IBM manufactures and sells computer hardware and software, and it offers infrastructure, hosting and consulting services in areas...
  
   Lotus Domino
• IceWarp
  IceWarp
  IceWarp Ltd. is a software company in Springfield, VA developing messaging, voice and collaboration products for small, medium and corporate business. The company has offices in the Czech Republic and United States.- Products :...
  
   (IceWarp / Merak Mail Server)
• Ipswitch IMail Server
  Ipswitch IMail Server
  Ipswitch IMail Server is an email server application with groupware functionality that runs on Microsoft Windows OS. It was developed in 1994 by Ipswitch, Inc., a software company based in Lexington, Massachusetts.-Features:...
  
  
• James
  Apache James
  Apache James, aka Java Apache Mail Enterprise Server or some variation thereof, is an open source SMTP and POP3 mail transfer agent and NNTP news server written entirely in Java. James is maintained by contributors to the Apache Software Foundation, with initial contributions by Serge Knystautas....
  
   (Java Apache Mail Enterprise Server)
• Kerio Connect
• MagicMail
  MagicMail
  The MagicMail email server is a turn-key carrier grade email platform designed specifically for the tier-2 Internet service provider and telco market. It is built to run on a custom LinuxMagic-built operating system based on Linux. MagicMail utilizes open source technologies blended with...
  
  
• Mailtraq
  Mailtraq
  Mailtraq is a commercial mail and groupware server. It runs on Microsoft Windows.-Features:The email server offers POP3, SMTP, HTTP, IMAP4 all with SSL/TLS support, plus NNTP, and provides webmail functionality....
  
  
• MDaemon Email Server for Windows
  MDaemon Email Server for Windows
  MDaemon, developed by Alt-N Technologies, is a multi-language SMTP/POP3 Windows-based mail server software with web mail, remote administration, secure Instant Messenger , and Anti-spam techniques security...
  
   by Alt-N Technologies
• Mercury Mail Transport System
  Mercury Mail Transport System
  Mercury Mail Transport System is a standards-compliant donationware mail server developed by David Harris, who also develops the Pegasus Mail client....
  
  
• Meldware Communication Suite
• MeTA1 (successor of the sendmail X project)
• Microsoft Exchange Server
  Microsoft Exchange Server
  Microsoft Exchange Server is the server side of a client–server, collaborative application product developed by Microsoft. It is part of the Microsoft Servers line of server products and is used by enterprises using Microsoft infrastructure products...
  
  
• MMDF
  MMDF
  MMDF, the Multichannel Memorandum Distribution Facility, is a message transfer agent , a computer program designed to transmit email.-History:...
  
  
• Novell GroupWise
  Novell GroupWise
  GroupWise is a messaging and collaborative software platform from Novell that supports email, calendaring, personal information management, instant messaging, and document management. The platform consists of the client software, which is available for Windows, Mac OS X, and Linux, and the server...
  
  
• Novell NetMail
• Openwave Systems
• Open-Xchange
  Open-Xchange
  Open-Xchange Server is an open source project sponsored by Open-Xchange, Inc., developing collaboration software; i.e. email, calendaring, address book, etc. Product offerings based on Open-Xchange Server are marketed under the brand of Open-Xchange Server and various other names, e.g. 1&1...
  
  
• Oracle Beehive
  Oracle Beehive
  Oracle Beehive is collaboration platform software developed by Oracle Corporation that combines email, team collaboration, instant messaging, and conferencing in a single solution...
  
  
• Oracle Communications Messaging Exchange Server
• Postfix
  Postfix (software)
  In computing, Postfix is a free and open-source mail transfer agent that routes and delivers electronic mail. It is intended as a fast, easier-to-administer, and secure alternative to the widely-used Sendmail MTA....
  
  
• qmail
  Qmail
  qmail is a mail transfer agent that runs on Unix. It was written, starting December 1995, by Daniel J. Bernstein as a more secure replacement for the popular Sendmail program...
  
  
• qpsmtpd
  Qpsmtpd
  qpsmtpd is an SMTP daemon written in Perl. It was originally designed to be a drop-in replacement for qmail-smtpd, the SMTP component of qmail, and it is now also compatible with Postfix, Exim, sendmail and virtually any software that "speaks SMTP"...
  
  
• Scalix
  Scalix
  Scalix is an e-mail and groupware server that runs on Linux, licensed under the Scalix Public License .Scalix provides e-mail, group calendaring and other collaborative software, which are standard in groupware...
  
  
• Sendmail
  Sendmail
  Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and -delivery methods, including the Simple Mail Transfer Protocol used for email transport over the Internet....
  
  
• Smail
  Smail
  Smail-3 is a mail transfer agent used on Unix-like operating systems. It is freely available but is not a package under the GNU GPL. It aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail...
  
  
• SparkEngine
• SMTP Proxy
• Sun Java System
  Sun Java System
  Sun Java System is a brand used by Sun Microsystems to market computer software. The Sun Java System brand superseded the Sun ONE brand on September 2003...
  
  
• Synovel Collabsuite
  Synovel Collabsuite
  Synovel Collabsuite is an open source Linux mail server with calendaring and chat features . The server also includes anti-spam, antivirus, email archival.User can access the features through Desktop client, Web or Mobile phone.- Features :...
  
   ( Linux mail server )
• WinGate
  WinGate (computing)
  WinGate is an Integrated Gateway Management system for Microsoft Windows, providing firewall and NAT services, along with a number of integrated proxy servers and also email services ....
  
  
• XMail
  XMail
  XMail is a free open-source, developed by Davide Libenzi, POP3/ESMTP mail server for Unix and Microsoft Windows operating systems. Unlike other email servers, XMail does not require that each user have a system account, instead it uses flat-file databases to store user information...
  
  
• XMS Email Application Server
• Zarafa
  Zarafa (software)
  Zarafa is the name of an European open source collaborative software, developed in Delft, the Netherlands. The company that develops Zarafa, previously known as Connectux, is also called Zarafa. The Zarafa groupware provides email storage on the server side and brings its own Ajax-based mail client...
  
  
• Zimbra
  Zimbra
  Zimbra Collaboration Suite is a groupware product created by Zimbra, Inc., located in Palo Alto, California, USA. The company was purchased by Yahoo! in September 2007, and subsequently purchased by VMware on Tuesday, January 12, 2010. The software consists of both client and server components...
  
  
• ZMailer
  ZMailer
  ZMailer is a mail transfer agent for Linux, BSD and other Unix-like systems.It is intended for gateways or mail servers or other large site environments that have extreme demands on the abilities of the mailer....
  
  

POP

Post Office Protocol

In computing, the Post Office Protocol is an application-layer Internet standard protocol used by local e-mail clients to retrieve e-mail from a remote server over a TCP/IP connection. POP and IMAP are the two most prevalent Internet standard protocols for e-mail retrieval. Virtually all modern...

/IMAP

Internet Message Access Protocol

Internet message access protocol is one of the two most prevalent Internet standard protocols for e-mail retrieval, the other being the Post Office Protocol...

 

• agorum core
  Agorum core
  agorum core is a free Open-Source Enterprise Content Management system by agorum Software GmbH from Germany. One of the main features is the Document-Network-Share. With that the documents within the ECM are shown as a normal network share...
  
   Open Source Document Management/Enterprise Content Management
• Alt-N Technologies' MDaemon Email Server for Windows
  MDaemon Email Server for Windows
  MDaemon, developed by Alt-N Technologies, is a multi-language SMTP/POP3 Windows-based mail server software with web mail, remote administration, secure Instant Messenger , and Anti-spam techniques security...
  
  
• Apache James
  Apache James
  Apache James, aka Java Apache Mail Enterprise Server or some variation thereof, is an open source SMTP and POP3 mail transfer agent and NNTP news server written entirely in Java. James is maintained by contributors to the Apache Software Foundation, with initial contributions by Serge Knystautas....
  
  
• Axigen
  AXIGEN
  Axigen, marketed as AXIGEN, is a mail server with groupware and collaboration functionalities. It supports SMTP/ESMTP, IMAP, POP3 and webmail services, and has an integrated mailing list server...
  
  
• Bongo
• Citadel
  Citadel/UX
  Citadel/UX is a collaboration suite that is descended from the Citadel family of programs which became popular in the 1980s and 1990s as a bulletin board system platform. It is designed to run on open source operating systems such as Linux or BSD...
  
   - uses a database-driven mail store
• CommuniGate Pro
  CommuniGate Pro
  CommuniGate Pro is the a server software product that provides IP based, Unified Communications services, including e-mail, Voice over IP, IM and GroupWare capabilities....
  
  
• ContactOffice
  ContactOffice
  ContactOffice is a web application accessible with a html browser , developed by ContactOffice Group. It is a virtual office consisting of a set of interrelated tools ....
  
  
• Courier Mail Server
  Courier Mail Server
  The Courier mail server is a mail transfer agent server that provides ESMTP, IMAP, POP3, SMAP, webmail, and mailing list services with individual components. It is best known for its IMAP server component....
  
   - uses Maildir
  Maildir
  The Maildir e-mail format is a common way of storing e-mail messages, where each message is kept in a separate file with a unique name, and each folder is a directory...
  
   format
• Cyrus IMAP server
  Cyrus IMAP server
  The Cyrus IMAP server differs from other IMAP server implementations in that it is generally intended to be run on sealed servers, where normal users cannot log in. The mail spool uses a filesystem layout and format similar to the Maildir format used by other popular email servers such as qmail,...
  
  
• DBMail
  DBMail IMAP and POP3 server
  The DBMail IMAP and POP3 is a fast, scalable IMAP4 and POP3 server that stores all email and users in a Postgresql, MySQL or SQLite database.- How does it work? :...
  
  
• Dovecot
  Dovecot (software)
  Dovecot is an open source IMAP and POP3 server for Linux/UNIX-like systems, written primarily with security in mind. Developed by Timo Sirainen, Dovecot was first released in July 2002...
  
   - uses Maildir
  Maildir
  The Maildir e-mail format is a common way of storing e-mail messages, where each message is kept in a separate file with a unique name, and each folder is a directory...
  
  , legacy mbox
  Mbox
  mbox is a generic term for a family of related file formats used for holding collections of electronic mail messages. All messages in an mbox mailbox are concatenated and stored as plain text in a single file...
  
  , and experimental dbox format
• Eudora Internet Mail Server
  Eudora Internet Mail Server
  Eudora Internet Mail Server is a POP3, IMAP, and SMTP server for Mac OS.-History:In 1993 Glenn Anderson started development on what was then called MailShare, which was available as freeware. In 1995 MailShare was purchased by Apple Computer and renamed to Apple Internet Mail Server. Version 1.0...
  
  
• FirstClass
  FirstClass
  FirstClass is a client/server groupware, email, online conferencing, voice/fax services, and bulletin-board system for Windows, Macintosh, and Linux...
  
  
• Gordano Messaging Suite
  Gordano Messaging Suite
  Gordano Messaging Suite is a commercial mail and groupware server developed by Gordano Ltd. It runs on Windows, Linux, Solaris, and AIX. Originally called NTMail which was the first commercially available mail for the Windows platform, the products were rebranded to the Gordano Messaging Suite in...
  
  
• HMailServer
  HMailServer
  hMailServer is a free email server for Windows created by Martin Knafve. It runs as a Windows service and includes administration tools for management and backup. It has support for IMAP, POP3, and SMTP email protocols. It uses database engines to store configuration and index data but the actual...
  
  
• Ipswitch IMail Server
  Ipswitch IMail Server
  Ipswitch IMail Server is an email server application with groupware functionality that runs on Microsoft Windows OS. It was developed in 1994 by Ipswitch, Inc., a software company based in Lexington, Massachusetts.-Features:...
  
  
• Kerio Connect
• IBM
  IBM
  International Business Machines Corporation or IBM is an American multinational technology and consulting corporation headquartered in Armonk, New York, United States. IBM manufactures and sells computer hardware and software, and it offers infrastructure, hosting and consulting services in areas...
  
   Lotus Domino IMAP4 Server
• MagicMail
  MagicMail
  The MagicMail email server is a turn-key carrier grade email platform designed specifically for the tier-2 Internet service provider and telco market. It is built to run on a custom LinuxMagic-built operating system based on Linux. MagicMail utilizes open source technologies blended with...
  
  
• Mailtraq
  Mailtraq
  Mailtraq is a commercial mail and groupware server. It runs on Microsoft Windows.-Features:The email server offers POP3, SMTP, HTTP, IMAP4 all with SSL/TLS support, plus NNTP, and provides webmail functionality....
  
  
• Meldware Communication Server (Free open source multi-platform mail server)
• Mercury Mail Transport System
  Mercury Mail Transport System
  Mercury Mail Transport System is a standards-compliant donationware mail server developed by David Harris, who also develops the Pegasus Mail client....
  
  
• Microsoft Exchange Server
  Microsoft Exchange Server
  Microsoft Exchange Server is the server side of a client–server, collaborative application product developed by Microsoft. It is part of the Microsoft Servers line of server products and is used by enterprises using Microsoft infrastructure products...
  
  
• Microsoft Windows
  Microsoft Windows
  Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...
  
   POP3 Service
• Novell GroupWise
  Novell GroupWise
  GroupWise is a messaging and collaborative software platform from Novell that supports email, calendaring, personal information management, instant messaging, and document management. The platform consists of the client software, which is available for Windows, Mac OS X, and Linux, and the server...
  
  
• Novell NetMail
• Open-Xchange
  Open-Xchange
  Open-Xchange Server is an open source project sponsored by Open-Xchange, Inc., developing collaboration software; i.e. email, calendaring, address book, etc. Product offerings based on Open-Xchange Server are marketed under the brand of Open-Xchange Server and various other names, e.g. 1&1...
  
  
• Oracle Beehive
  Oracle Beehive
  Oracle Beehive is collaboration platform software developed by Oracle Corporation that combines email, team collaboration, instant messaging, and conferencing in a single solution...
  
  
• Synovel Collabsuite
  Synovel Collabsuite
  Synovel Collabsuite is an open source Linux mail server with calendaring and chat features . The server also includes anti-spam, antivirus, email archival.User can access the features through Desktop client, Web or Mobile phone.- Features :...
  
   (IMAP & POP with Calendar, Chat, anti-spam, Archival, data backup)
• UW IMAP
  UW IMAP
  The UW IMAP server is the reference server implementation of the IMAP protocol. Unlike other server implementations, it is designed to be aggressively compatible with existing legacy mail stores and systems, and to be "plug-and-play" installable without requiring any site-specific configuration.UW...
  
   - uses mix
  MIX (Email)
  MIX is a high-performance, indexed, on-disk email storage system that is designed for use with the IMAP protocol. MIX was designed by Mark Crispin, the author of the IMAP protocol. Server support for it has been included in releases of UW IMAP since 2006, Panda IMAP, and Messaging Architects...
  
  , mbx
  MBX
  MBX may refer to:* Maribor Airport - the IATA Airport Code for Maribor Airport* MBX/MBX50 - A motorcycle manufactured by Honda* MBX Systems - A privately held company located in Lake County, Illinois* MOBONIX - An American rap artist and music producer...
  
  , and legacy mbox
  Mbox
  mbox is a generic term for a family of related file formats used for holding collections of electronic mail messages. All messages in an mbox mailbox are concatenated and stored as plain text in a single file...
  
   format.
• WinGate
  WinGate (computing)
  WinGate is an Integrated Gateway Management system for Microsoft Windows, providing firewall and NAT services, along with a number of integrated proxy servers and also email services ....
  
  
• XMail
  XMail
  XMail is a free open-source, developed by Davide Libenzi, POP3/ESMTP mail server for Unix and Microsoft Windows operating systems. Unlike other email servers, XMail does not require that each user have a system account, instead it uses flat-file databases to store user information...
  
  
• Zarafa
  Zarafa (software)
  Zarafa is the name of an European open source collaborative software, developed in Delft, the Netherlands. The company that develops Zarafa, previously known as Connectux, is also called Zarafa. The Zarafa groupware provides email storage on the server side and brings its own Ajax-based mail client...
  
  
• Zimbra
  Zimbra
  Zimbra Collaboration Suite is a groupware product created by Zimbra, Inc., located in Palo Alto, California, USA. The company was purchased by Yahoo! in September 2007, and subsequently purchased by VMware on Tuesday, January 12, 2010. The software consists of both client and server components...
  
  

Mail filtering

• Alt-N Technologies' MDaemon Email Server for Windows
  MDaemon Email Server for Windows
  MDaemon, developed by Alt-N Technologies, is a multi-language SMTP/POP3 Windows-based mail server software with web mail, remote administration, secure Instant Messenger , and Anti-spam techniques security...
  
  
• ASSP
  Anti-Spam SMTP Proxy
  The Anti-Spam SMTP Proxy server project is an Open Source, Perl based, platform-independent transparent SMTP proxy server available at SourceForge.net that leverages numerous methodologies and technologies to both rigidly and adaptively identify e-mail spam...
  
  
• Axigen
  AXIGEN
  Axigen, marketed as AXIGEN, is a mail server with groupware and collaboration functionalities. It supports SMTP/ESMTP, IMAP, POP3 and webmail services, and has an integrated mailing list server...
  
  
• Bayesian filters
  Bayesian filtering
  Bayesian filtering may refer to:* Bayesian spam filtering, a method to detect spam.* Recursive Bayesian estimation, a method to estimate the state of a system evolving in time.* Bayes' theorem...
  
  
• Bogofilter
  Bogofilter
  Bogofilter is a mail filter that classifies e-mail as spam or ham by a statistical analysis of the message's header and content . The program is able to learn from the user's classifications and corrections. It was originally written by Eric S...
  
  
• DSPAM
  DSPAM
  DSPAM is a free software statistical spam filter written by Jonathan A. Zdziarski, author of the book Ending Spam and other books. It is intended to be a scalable, content-based spam filter for large multi-user systems...
  
  
• Gordano Messaging Suite
  Gordano Messaging Suite
  Gordano Messaging Suite is a commercial mail and groupware server developed by Gordano Ltd. It runs on Windows, Linux, Solaris, and AIX. Originally called NTMail which was the first commercially available mail for the Windows platform, the products were rebranded to the Gordano Messaging Suite in...
  
  
• Hexamail Guard
  Hexamail Guard
  Hexamail Guard is a server based software antispam filter for the Windows and Linux platforms.Acting as a gateway at the SMTP level or as a plugin for Microsoft Exchange Server, it supports most common anti spam filtering techniques including:...
  
  
• Kerio Connect
• MagicMail
  MagicMail
  The MagicMail email server is a turn-key carrier grade email platform designed specifically for the tier-2 Internet service provider and telco market. It is built to run on a custom LinuxMagic-built operating system based on Linux. MagicMail utilizes open source technologies blended with...
  
  
• MagicSpam
  MagicSpam
  MagicSpam is an anti-spam computer program designed to be integrated with an email server to automatically prevent spam from reaching an email user's inbox....
  
  
• MailChannels
  MailChannels
  MailChannels Corporation is an anti-spam technology company founded in 2004 and based in Vancouver, British Columbia. The firm was created by some former employees of ActiveState to develop new techniques for fighting spam. The company's first product, "Traffic Control," is a software-based SMTP...
  
  
• MailScanner
  MailScanner
  MailScanner is an open source e-mail security system for use on Unix e-mail gateways and was first released in 2001. It protects against viruses and spam...
  
  
• Mailtraq
  Mailtraq
  Mailtraq is a commercial mail and groupware server. It runs on Microsoft Windows.-Features:The email server offers POP3, SMTP, HTTP, IMAP4 all with SSL/TLS support, plus NNTP, and provides webmail functionality....
  
  
• MIMEDefang
  MIMEDefang
  MIMEDefang is a GPL licensed framework for filtering e-mail. It uses sendmail's "Milter" API, some C glue code, and some Perl code to let the user write high-performance mail filters in Perl.MIMEDefang can be used to:* Block viruses...
  
  
• Procmail
  Procmail
  procmail is a mail delivery agent capable of sorting incoming mail into various directories and filtering out spam messages. Procmail is widely used on Unix-based systems and stable, but no longer maintained; users who wish a maintained program are advised to use an alternative MDA, such as...
  
  
• PureMessage
  PureMessage
  Sophos PureMessage is an anti-spam program by Sophos plc, which is aimed primarily at corporate environments....
  
  
• SurfControl
  SurfControl
  SurfControl Plc., was a British software company based in Cheshire, England. The company provided website filtering, e-mail filtering and desktop security software for both enterprise and home users....
  
  
• SpamAssassin
  SpamAssassin
  SpamAssassin is a computer program released under the Apache License 2.0 used for e-mail spam filtering based on content-matching rules. It is now part of the Apache Foundation....
  
  
• WinGate
  WinGate (computing)
  WinGate is an Integrated Gateway Management system for Microsoft Windows, providing firewall and NAT services, along with a number of integrated proxy servers and also email services ....
  
  
• Vipul's Razor
  Vipul's Razor
  Vipul's Razor is a checksum-based, distributed, collaborative, spam-detection-and-filtering network. Through user contribution, Razor establishes a distributed and constantly updating catalogue of spam in propagation that is consulted by email clients to filter out known spam. Detection is done...
  
  
• Webroot

External links

• MTA Comparison article by Dan Shearer, last updated January 2007
• Mail Servers Distribution Around the World