Webmail Mobile é um cliente de e-mails desenvolvido em JSP/Servlet. Totalmente projetado com design e funcionalidades voltados para smartphones e dispositivos móveis.
gavamail is a POP3/IMAP server implemented in JAVA for reading your gmail e-mail with your favorite mail client. Currently only POP3 is implemented but I hope to implement IMAP too. Libraries provided by the g4j and libgmail projects are used.
Encki Mail is a web based e-mail system that focusses on ease of use for both the user and the system administrator. The project is being developed for Linux using the popular PHP + MySQL combination.