
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: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Courier-MTA is an open source mail transfer agent (MTA) used for sending, receiving, and routing email. It is designed to be fast, scalable, and flexible with high throughput.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API