I wrote a similar thing to this too: https://github.com/hitchtest/hitchsmtp#bad-smtp-server https://github.com/hitchtest/hitchsmtp#bad-smtp-server It just outp

I wrote a similar thing to this too: https://github.com/hitchtest/hitchsmtp#bad-smtp-server https://github.com/hitchtest/hitchsmtp#bad-smtp-server It just outputs the mail it receives to stdout as JSON for easy parsing. Sending to specific email addresses "e.g. 451-please-try-again-later@smtperrors.com" will trigger specific SMTP errors.