Thanks everyone for the suggestions, here is my summary of responses:

Configuration Checkers:

  Web Based

    1. mxtoolbox.com
    2. gmail -> view source

  CLI

    1. mailsec-check, https://github.com/foxcpp/mailsec-check

Email Echo Testers:

1. check-a...@verifier.port25.com
2. https://www.mail-tester.com
3. e...@univie.ac.at
4. p...@stamper.itconsult.co.uk

I was also hoping for some testing methodologies which could be used in
a private staging or development environment, but none of those
materialized.
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