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HyperPool is a 100% pure Java project for network services management. TCP (HTTP/1.1, HTTPS, FTP, SMTP, POP3), UDP and SOCKS5 protocols support. Configurations: proxy, web server, mail server, download manager, port mapping.
JXchange is an mail server multiplataform, written in Java language, like MS-Exchange. This project includes SMTP server, POP3 server, IMAP server, web management interface and webmail designed to run in almost all OS.
Jack Mail Client: jackmailclient: Mail Client in Java This is a simple mail client uses any mail server with a minimal configuration you will have a robost email client. Purely written in java.
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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.
SPAM-Buster is a Java application for filtering SPAM based on statistical algorithms (currently Bayesian). The platform independant application can be used as graphical end-user client and additional service for mail server.
JEM is an SMTP server with pluggable components that let you
process email in any way you like. It can also extend beyond
emails into generalised message processing (like JMS) and can
even generate its own messages based on a Cron-like facility.
Ichabod is an SMTP/POP3 server, with mailing list support. Administration is via a web, or email
You can also use Ichabod to make your app receive email as an SMTP server.
You can also easily extend it by subclassing to add your own behaviors.