Anti-Spam SMTP Proxy Server implements multiple spam filters
Powerful Open Source Email Marketing app with analytics & segmentation
C library for sending e-mail (with attachments) from C/C++
A simple and fast cross-platform solution to send mass emails.
IGSuite is a web-ajax-based Integrated Groupware Suite
software for email automation (newsletters, transaction mails, etc.)
Unified Communications Server
JavaScript/XML engine for Apache
System to control who and when a group reads a document send by mail
An easy-to-use anti-spam email gateway
Multi user address book application accessable through the web.
Open source DMARC implementation
An unofficial web console to administer Apache James 3 server