
Description: MailerQ is an open source message queue for sending large volumes of email efficiently. It can process millions of messages per minute with low latency using concepts like event looping, message storage, and parallel processing.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Halon MTA is an email server software designed for businesses and organizations. It handles sending, receiving, and routing email with features like spam filtering, email security, automation, and analytics.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API