
Description: FakeSMTP is an open source SMTP test server that allows developers to test email sending from their applications without actually sending emails through an SMTP server. It is lightweight, easy to install, and useful for testing email functionality during development.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: MailCatcher is a simple, open source email testing tool for developers. It runs a local SMTP server to catch emails sent from web apps during development, allowing developers to preview them in a web interface instead of sending them externally.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API