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

Description: sSMTP is a lightweight SMTP client that can be used to send email from Linux servers. It allows Linux machines without a full mail server to relay mail through an external SMTP server, enabling applications and scripts to automatically send emails.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API