gavamail is a POP3/IMAP server implemented in JAVA for reading your gmail e-mail with your favorite mail client. Currently only POP3 is implemented but I hope to implement IMAP too. Libraries provided by the g4j and libgmail projects are used.
MailRefinery is a tiny Linux distribution which will turn a machine into a complete mail server including Spam Assassin, GPL Virus filtering, POP, SPOP, IMAP, IMP, Fetchmail and a complete PHP based web interface to control it all.
Working as a courier-mta frontend, QUICA can make a quick and friendly to use mail server. Tasks like creating accounts and forwards can be done easily. QUICA manages domains separately , allowing the delegation of each domain to different people.
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ISOS is an e-mail and web server. It is designed for ease of use and provides a quick way to e-presence for small businesses and organizations who lack the experience to benefit from high performance, open source software such as Sendmail, Courier Mail,
FrozenPop is a simple and easy to use POP3/SMTP server. Geared to accommodate multiple domains without having to create individual system accounts, FrozenPop installs < 5 mins. With MySQL authentication, creating users is simple.
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.
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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!