
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: SMTP Bucket is an email testing and debugging tool that allows you to capture, view, and analyze outbound email traffic without sending it to recipient inboxes. It provides a fake SMTP server to connect email clients or apps to, logs all email activity, and gives you tools to inspect messages.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API