Here's an idea. Ken will like this because there's no indication of how
the work would get done. What if nmh warned that a non-RFC-compliant
header were produced? It takes care of encoding Subject, etc., at the
moment, if needed. It could look out for In-Reply-To, References, etc.,
and warn or error if they're bad. Probably not at format time, since
who knows to what warped ends I'm deploying nmh, but when an email is
trundling towards being sent.
You don't need to hack nmh for this. Just find (or write) an external
program that does RFC(pick your favourite) validation, then run your
message through it at the 'what now?' prompt.
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