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pop3serv is a RFC1939-compliant implementation of the server-side part of POP3, the protocol used to retrieve email from a server. pop3serv is a framework which allowes the easy creation of POP3 servers for lots of different purposes.
RSS->IMAP server is a basic IMAP server implementation that allows you to browse your RSS feeds like emails. This is perfect for adding basic RSS functionality to older email clients that do not have RSS readers built in such as Outlook 2003.
Vaza-Mail Server is open source mail server which provides SMTP and POP3 server implemented in 100% Pure Java. It is a pure JavaImplementation using J2EE.
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.
jIMAP provides an java based implementation of the IMAP protocol. It provides direct access to all featurs of the IMAP protocol. It could be used to build a full blown mail program