
Description: msmtp is a command line SMTP client that can be used to send emails from the Linux command line or scripts. It is lightweight, easy to configure, and supports SMTP authentication, TLS encryption, several mailbox formats and more.
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