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.
Your own mailing system (most easiest to use with zero configuration) for the entire world (available in almost all the languages of the world) which will include Mail User Agent and MailTransferAgent thus trying to give maximum speed while transferrin
RMDS, the Reisinger Mail Delivery System is a MTA Solution entirely written in Java.
SMTP/SMTP-Rleay/POP/IMAP Services are supported.
RMDS makes use of a solid rdbms based mailstorage technique.
Administration capabilities are wide spread.
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SIMON is a very simple MTA and POP3 implementation. It is completely designed from the ground up and is useful for departmental or small to medium sized companies.