
Description: Postale.io is an easy-to-use email testing and analytics platform that allows you to test and optimize emails before sending them out. It provides detailed analytics on opens, clicks, rendering, spam testing, and more.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Tuta is an open source, privacy-focused email service that emphasizes security and anonymity. It offers end-to-end encryption, anonymous sign up without a phone number, and servers located in privacy-friendly jurisdictions.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API