
Description: Columba is an open-source email client for Linux, Windows, and macOS. It supports POP3 and IMAP for receiving emails and SMTP for sending emails. Key features include support for multiple email accounts, spam filtering, email searching, flexible message views, automatic contact grouping, and customizable keyboard shortcuts.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: FairEmail is an open source, privacy-focused email app for Android. It supports multiple accounts, end-to-end encryption, and blocks trackers and ads. FairEmail is lightweight, customizable, and respects user privacy.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API