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.
Hedwig is an open source IMAP, SMTP, POP3 server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database(MySQL or Oracle) and mail messages in a file system.
Visit http://hwmail.sourceforge.net/ for more information.
Wrappers around msmtp for use as queueing MTA with extra features
This project builds on top of the (and adds additional) scripts included with msmtp (a command-line send only email client) in order for it to act as a queueing Mail Transport Agent (by acting as the sendmail command; it also offer an minimalist SMTP server mode) with some additional features like verify-before-send (which requires you to confirm that you really do want to send email, after a required delay (cooling off period)) for those who need to think twice about the wisdom of what they...
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MgSMTP is a lightweight SMTP MTA, designed for Windows, very easy to configure, supports user authentication (AUTH LOGIN). If you want, it relays your e-mails towards your ISPs SMTP server. Of course, it takes e-mails from the PHP mail function.
Sendmail-Jilter is an Open Source implementation of the Sendmail milter protocol, for implementing milters in Java that can interface with the Sendmail MTA.
This project is a C++ library which allows incorporating DKIM into an existing MTA or other application. It provides full support for signing, verifying, and SSP. It is compliant with RFC 4871.
Policy-daemon for the postfix MTA in perl. Scores RBLs, RHSBLs, HELO, Client IP and MAIL FROM argument and sums up a score on which you can reject the mail before DATA will be received. Results are cached. I.e: a weighted SMTP filter before DATA (queue).
Apache James Mail Server hook for the famous Liferay Enterprise Portal. Uses James as mail server backend rather than Postfix/QMail/Sendmail. Easy to configure if you have production mail server(MTA) based on James.
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exim2awstats is a PHP script that can translate the log files from the Exim MTA (http://exim.org) into a format that can be used by the log analyzer AWStats (http://awstats.sourceforge.net).
RMDS, the Reisinger Mail Delivery System is a MTA Solution entirely written in Java.
SMTP/SMTP-Rleay/POP/IMAP Services are supported.
RMDS makes use of a solid rdbms based mailstorage technique.
Administration capabilities are wide spread.
SIMON is a very simple MTA and POP3 implementation. It is completely designed from the ground up and is useful for departmental or small to medium sized companies.
ExiBomb is a system designd to monitor mail traffic on the Exim based MTA server. The interface is developed in PHP. It reads the maillogs in a tail method and stores all relevant data in a MYSQL Database.The script reading the logs was developed in PERL.