The classic email sending library for PHP
Local, web-based mail server application. Slurp mails into oblivion!
Mail hosting made simple
Free Email Backup Software | Email Backup App for Android
Sync Outlook with Google, SOGo or any other CalDAV / CardDAV server
HotelSoft1.2Acs is a free open source software for the Hotel actvity
EasyMailer: Bulk Email/SMS Sender Using SMTP
SaltOS, ERP, CRM, Business Management Suite, Josep Sanz Campderrós
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Simple-to-use/-install issue-tracking system: web, REST, email, CLI
The first Open-Source high-performance MTA for high-volume senders
Strong Email & Apache Log Analysis with Active Security Features
software for email automation (newsletters, transaction mails, etc.)
Unified Communications Server
command line tool to manage email (alias-)domains/accounts/aliases …
Process messages held by Mailman for approval
Web and API based SMTP testing
JavaScript/XML engine for Apache
Zimbra Domain Admin for Zimbra Open Source Edition
Mail Alert Simple Mailer
Jnestor is another majordomo in java