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

Description: NikaMail is an open-source, privacy-focused email service. It allows users to send and receive encrypted emails for free without ads or user tracking. NikaMail uses end-to-end encryption to keep emails private.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API