
Description: Sendmail is a widely used open-source mail transfer agent (MTA) for routing and delivering email on Unix and Linux systems. It handles routing emails between mail servers and delivers them to local users' mailboxes.
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