Mail hosting made simple
PHP Email address validator
SaltOS, ERP, CRM, Business Management Suite, Josep Sanz Campderrós
Fast Bayesian spam filter along lines suggested by Paul Graham
HotelSoft1.3 is a free open source software for the Hotel activity
Simple-to-use/-install issue-tracking system: web, REST, email, CLI
Strong Email & Apache Log Analysis with Active Security Features
NaSMail is a standards-based webmail package written in PHP
Easily import email into TntConnect
Short perl script mail delivery agent
Multi-protocol server written in Java
Reduce misspelled email addresses in your web apps
imap cleanup & command line tool
Super simple mail merging for Mac OS X using CSV and Mac's Mail.app
Synchronizes the Mac OS X Address Book to and from an XML-based format
A free .NET library for accessing IMAP servers, written in C#