Anti-Spam SMTP Proxy Server implements multiple spam filters
SMTP email proxy and relay server
Powerful Open Source Email Marketing app with analytics & segmentation
Client daemon to move mail from POP and IMAP to your local computer
mailbox synchronizer
Fast Bayesian spam filter along lines suggested by Paul Graham
Remote anti spam utility
SaltOS, ERP, CRM, Business Management Suite, Josep Sanz Campderrós
C library for sending e-mail (with attachments) from C/C++
Strong Email & Apache Log Analysis with Active Security Features
IGSuite is a web-ajax-based Integrated Groupware Suite
Booking/reservation of meeting rooms/equipment with e-mail invitations