Amphora Light is a Web-based groupware server written in Python and Zope. It offers basic office functionality: document sharing, calendars, tasks, contacts, internet databases in the context of a hierarchical organization and flexible access rights.
This is a webmail server intended for personal use (though of course, commercial use is not forbidden, it's just not my focus with this project) using secure http. Since it has its own https server built in, it does not require complex configuration.
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.
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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!
...Web Dog and Bone allows to send messages to groups, start calls or join conferences and retreive RSS feeds directly to their mobile phone through SMS. Feeds can be added in a plug and play like way enabling the app to grow!
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.