pympsort, A Python Mail Processing and Sorting program. Takes mail from Standard in and reads a config file, delivers mail into Maildir format. Works great with Qmailg
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.
This is a filter that can be inserted in the qmail incoming mail path. It was designed to be
simple and easy to install. It's main purpose was to filter any email with executable
visual basic extensions.
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.