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. [email protected]
2. https://www.mail-tester.com
3. [email protected]
4. [email protected]
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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