
Description: Postbox is an email client for Windows and macOS that provides a clean, easy-to-use interface for managing multiple email accounts. It supports POP3, IMAP, Exchange, Gmail, Outlook.com, Yahoo and more.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: GyazMail is an open-source, self-hosted email server and webmail client. It is designed to provide easy email hosting and management for individuals and small organizations. GyazMail emphasizes security, privacy, and customizability in its feature set.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API