Robin MTA Tester is a development, debug and testing tool for MTA architects. It is powered by a highly customizable SMTP client designed to emulate the behaviour of popular email clients. A rudimentary server is also provided that is mainly used for testing the client.

The primary usage is done via JSON files called test cases. Cases are client configuration files run as Junit tests.

Download Link:- https://github.com/mimecast/robin

This site is under maintenance,
some features might not work!!!