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The Postfix Extensible Policy Daemon aims to provide a flexible framework for policy delegation in the context of the Postfix MTA. It is written in Perl and accepts policy check routines in the form of Perl modules.
ClamCour is a Courier-MTA multithread filter that allows Courier to scan mail for viruses using Clam Antivirus package. Attachments can be "quarantinated" and custom domain-based email reports can be sent.
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.
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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).
This program is a minimal SMTP client that takes an email
message body and passes it on to a SMTP server (default is the
MTA on the local host). Since it is completely self-supporting,
it is especially suitable for use in restricted environments.
MTA independent transparent Greylist proxy with very little dependencies. greyd runs as a front end to your existing SMTP server to reject as much spam as possible before it hit the real SMTP server.
AISK is an acronym for Artificial Intelligence Spam Killer. It is a server side filter that acts as a kind of PROXY and uses SMTP to communicate with MTA. Main decision mechanism is based on artificial neural network capable of finding patterns, learning
Spammer is an anti-spam mail filter for Sendmail and Postfix. It uses libmilter to communicate with the MTA. Spammer checks client IP addresses as well as all IP addresses in the "Received: " headers against a DNSBL database.
elspy is an extension to the Exim MTA that allows Exim users to supply a local_scan() function written in Python instead of C. (Exim's local_scan() API lets sysadmins supply site-specific code for approving/rejecting email messages at SMTP time.)
dkfd is a DomainKeys filter daemon using libdomainkeys library. targeted usage is SMTP proxy of Postfix MTA. Currently developing under Linux/FreeBSD, and Solaris.
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.
ASMMS -- Anonymous SMTP Mail Message Sender
... is an simple mta, written in C, for sending mails through mail
servers, which have no authentication (AUTH). It should work
on nearly all POSIX systems, tested only with SunOS, Linux and
HPUX.
...It can be used to send (broadcast) e-mails to a huge number of users. Users can be stored in files, database or ldap directory. Limez have built-in SMTP-capabilities (no external MTA required).
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.
Linux-based MTA & POP/IMAP server written in JAVA, that does NOT use Linux accounts. Instead, it uses SQL database to perform most operations and transactions. Goals: SIMPLE configuration, ready-to-go out-of-the-box.