Web and API based SMTP testing
Phishing Campaign Toolkit
Python API for Sendmail Milters.
An Asynchronous Pipelined Java client for Redis
Simple, modern & fast web-based email client
Zimbra Domain Admin for Zimbra Open Source Edition
Write email in Markdown and render them before sending
A Powerful PHP bulk email sending script with smtp support.
Multi-protocol server written in Java
tinyCampaign is a simple and lightweight newsletter system.
Simple, web-based address & phone book
A mailing list manager with an excellent web interface
Free and open source webmail software
Open Source Anti-Spam and Anti-Virus Gateway