GitHub - 4commerce-technologies-AG/midi-smtp-server: The highly customizable ruby SMTP-Server and SMTP-Service library with builtin support for AUTH and SSL/STARTTLS, 8BITMIME and SMTPUTF8, IPv4 and IPv6 and additional features.
smtp-services · GitHub Topics · GitHub
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GitHub - tweakers/MockMock: A mock SMTP server built with Java
GitHub - kalyan02/Simple-SMTP-Server: Simple python smtp server with web view for viewing incoming mail
GitHub - penguinboy/Super-SMTP-Server: SMTP server written in C#. Doesn't actually deliver any mail, but perfect for testing that your app is correctly sending mail.