Jnestor is another majordomo in java
IMAP to IMAP Copy
an 'auto-reply' bot for your mail server
CheckeredFlag is a super simple mail server.
An unofficial web console to administer Apache James 3 server
Simple web interface for Postfix domains, accounts, aliases
The free cross-platform antivirus software tool-kit
Free and open source webmail software
Source code for be able to use Relation Tags.
File sharing via e-mail
Business webmail modular application with mobile client
Webmail made easy!
A simple native java network library