I am thinking about topics like "What is better: A cluster with a single MX, or multiple machines with separate MXes?" "What trust can be put into the name that comes after a HELO statement? Can we demand that it resolves?" "If my secondary gets a mail while the primary is reachable from the secondary, should the secondary 4xx the incoming message?"
Where would I go with questions like these?
I don't know of a forum but one of these is just in the RFC 2821 specs:
Per RFC spec the string following the HELO does not need to be resolvable, although it should be a FQDN when meaningful. see 4.1.1.1. You can demand that it resolves, but you'll loose the ability to communicate with some properly configured MX'es.
From which you can infer "absolutely zero trust can be put in the HELO'ed name." but that should be common sense.. you can trust almost nothing in a SMTP transaction.
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