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Hedwig is an open source IMAP, SMTP, POP3 server written in Java, designed with ease of installation and configuration in mind. Hedwig enables storage of mail message headers in a relational database(MySQL or Oracle) and mail messages in a file system.
Visit http://hwmail.sourceforge.net/ for more information.
JXchange is an mail server multiplataform, written in Java language, like MS-Exchange. This project includes SMTP server, POP3 server, IMAPserver, web management interface and webmail designed to run in almost all OS.
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Welcome to the project page of the Open JMail Server - a scalable Java email server. Features POP, SMTP, IMAP, dynamic pluggable storage design, modular protocol handling, easy XML configuration and much more.