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IMAP4 server working on top of SQL database (currently PostgreSQL but Oracle may work too). It has some unique features like elimination of duplicate messages throughout the whole system, possibility of clustering or load balancing etc.
Philter is a mail filter written in Python to sort mail in a Qmail style Maildir on Linux. It is used in association with a mail fetching tool like getmail. A properties file is used to setup the basic configuration.
mailgate is a set of Python scripts we used at my former company to transfer email a) from a POP3 account to our internal mail server, b) from a POP3 account to a mailbox file and c) from a mailbox file to a SMTP server.
Monty's Postcard Server is an CGI application written in Python that makes putting up a Postcard Server a breeze. The only thing the Admin has to do is to supply the Images. Everything is configurable of cause!
Secure Email List Services (SELS) provides software for private email discussion lists compatible with common email clients. SELS enables list members to exchange encrypted messages without exposing plaintext messages on the list server.