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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.
Sortmail is a program to process incoming email, classify it and
process it accordingly. Sortmail can handle incoming email as it
arrives or download from a POP server. Sortmail is easier to
configure than procmail and can replace fetchmail.
Blocks spam without blocking any legitimate messages
SMC anti-spam e-mail milter (plug-in) is an software application designed to significantly reduce the amount of SPAM/UCE (junk-mail) you receive. SMC uses a greylisting like technique to stop the junk-mail and a set of dynamic auto "whitelists" for unknown, but legitimate senders. In purpose of anti-virus protection the program can use very popular Clam AntiVirus engine as a back end.
SMWrapper receives e-mails as standard sendmail program, filters them for X-PHP-Script in the Header and manages limits and informs the user and administrator when a limit is reached. After processing, the real sendmail program gets invoked.
The program implements the CIDR merging with whitelisting (network exclusion). Output will be summarized to be as small as possible. The program has been widely used for blacklist merge and optimization.
Surblhost is a small program to look up hostnames in the Spam URI Realtime Blocklists (SURBL). Many spam filters and related programs use SURBL to determine if given hosts have been used as links in spam email.
SORBS - Spam and Open Relay Blocking System - NOT http://www.sorbs.net/ This project is to provide a SMTP proxy that automatically checks incoming SMTP connections for origination from a server with an unsecured SMTP server and/or Proxy server.
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OdeiaVir is a Free Software program designed to integrate virus scanning into an e-mail server. It currently only supports qmail as an MTA, although Sendmail support is in the works.