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The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, Webmail, calendaring, and mailing list services.
E-MailRelay is a simple SMTP proxy and relay MTA, written in C++, for Linux and Windows. As a proxy all messages can be passed through a user-defined program, such as a spam-filter, which can drop, readdress, or edit messages as they pass through.
Highly scalable/configurable Messaging Platform allowing users in a domain to be distributed on multiple hosts, has multiple queues. Provides virtual domains/users in MySQL. Modern MSP class qmail replacement with ESMTP, POP3/IMAP, QMTP, QMQP support
jumfi will provide a java based uniform mail filter interface using C, JNI and Java. It will allow mail filters build in java to be applied to multiple mail servers of similar and different design.
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Spey is the easy way to reduce the amount of spam you receive. It sits between your mail server and the outside world and performs greylisting and other verification checks. It needs very little configuration and no mail server setup and Just Works(TM).
DSN Support for Exim. This patch allows Exim 4.xx to support the sending of email Delivery Status Notifications.
From Exim 4.83 onwards DSN is now included as standard (based on this patch).
dsn_process was a removed option of this standard inclusion and so the patches after 4.76 will re-enable that functionality and provide a binary with the same options / configurations as previously.
Mailafar is a mail server designed for use in difficult communication environments providing a full set of Internet email protocols, web mail, web admin, dial-in and wireless LAN access control. It will run on Linux, FreeBSD and Windows.
smtptrapd is a multi-threaded daemon written in C that provides a RFC 2821 compliant SMTP service that always returns a 4xx soft error to the RCPT TO verb. It can be deployed as a secondary MX to reduce the amount of inbound spam.
The Black Hole MTA is for use in automated package build systems. It looks like a Mail Transfer Agent (MTA) and email goes in but nothing comes out. It is intended for use in chroot jails for automated package build systems.
Tools for a mail delivery service, including LMTP and POP3 servers and also getpwnam() emulation. Mail is stored in Maildir++ format (qmail plus courier extensions as soft quota and subfolders). User defined filter and virtual domains are supported.
Rumble is a mail server suite for SMTP (ESMTPSA), HTTP, POP3 and IMAP4v1 with an extensive C/C++ and Lua API for scripting. It comes with support for SSL/TLS, SQLite and MySQL and has a web-based administration and webmail feature. Additional included modules feature greylisting, DNS blacklisting, SpamAssassin support and dynamic performance scaling as well as a multithreaded structure that allows for clustering of multiple servers for one or all domains, and with the ease of the Lua API,...
Mailster is a project aimed at testing software mail capabilities. It provides a mail server container to test emails sent by your apps without rewriting your application code.
ESMTP MTA is a user configurable relay-only MTA with a sendmail-compatible syntax, based on libESMTP and supporting the AUTH (including the CRAM-MD5 and NTLM SASL mechanisms) and the StartTLS SMTP extensions.
tMTA - A tiny|trivial MTA tMTA (pronounced 'tomata', like 'tomato' :) is a miniature Mail Transport Agent. tMTA only supports local delivery to local users. It does not support SMTP or any form of inter-computer mail transport.
This is a POP3 to SMTP bridge that will use the SMTP Trace headers to determine who it's from and to. Designed to work with catch all POP3 accounts. Configuration for the POP3 and SMTP accounts are in a CSV file.
This is a source and binary distribution of the worlds second most popular Mail Transport Agent QMAIL. This distribution includes the QMAIL MTA with all patches, libraries and tools for POP3, IMAP, MYSQL, Web based clients and virtual domain support.
The Postfix http map type allows you to hook up Postfix to a server with HTTP protocol, such as apache lighttpd nginx, etc. You need to write a CGI with C CPP Perl PHP etc, to complete the HTTP protocol to your database proprietary protocol conversion.
FMTA is a simple SMTP/POP3 server designed to run on Fox boards (Fox board is a small but powerful embedded computer running a complete GNU/Linux system).