
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: Gmail is a free email service provided by Google. It offers great spam filtering, 15GB of storage, support for email labeling, automatic sorting, integrated chat, and robust search capabilities.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API