Anti-Spam SMTP Proxy Server implements multiple spam filters
SMTP email proxy and relay server
Powerful Open Source Email Marketing app with analytics & segmentation
mailbox synchronizer
Fast Bayesian spam filter along lines suggested by Paul Graham
SaltOS, ERP, CRM, Business Management Suite, Josep Sanz Campderrós
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
C library for sending e-mail (with attachments) from C/C++
IGSuite is a web-ajax-based Integrated Groupware Suite
A simple and fast cross-platform solution to send mass emails.
Gross greylisting server
Booking/reservation of meeting rooms/equipment with e-mail invitations
Simple-to-use/-install issue-tracking system: web, REST, email, CLI