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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