Browse free open source Email software and projects for Server Operating Systems below. Use the toggles on the left to filter open source Email software by OS, license, language, programming language, and project status.
Anti-Spam SMTP Proxy Server implements multiple spam filters
Fast Bayesian spam filter along lines suggested by Paul Graham
Mail Alert Simple Mailer
Microsoft Exchange compatible server and client libraries
eMail is a fork of Interlink for IA-32 i686 with more optimizations.
CRM114 milter for sendmail
QSF milter for sendmail