
Description: Postfix is a popular open source Mail Transfer Agent (MTA) that routes and delivers email. It is a fast, easy to administer, and secure alternative to Sendmail. Postfix handles basic email routing and delivery well.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Mail-in-a-Box is an open source email server that allows you to set up and manage email on your own server or virtual private server. It bundles together common email components like Postfix, Dovecot, SpamAssassin, and OpenDKIM into an easy-to-manage package.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API