SMTP email proxy and relay server
Fast Bayesian spam filter along lines suggested by Paul Graham
Client daemon to move mail from POP and IMAP to your local computer
mailbox synchronizer
C library for sending e-mail (with attachments) from C/C++
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Strong Email & Apache Log Analysis with Active Security Features
Gross greylisting server
Remote anti spam utility
software for email automation (newsletters, transaction mails, etc.)
secure, reliable, fast MTA
JavaScript/XML engine for Apache