Thanks for all the replies.

Is it even worth checking the cert chain at all?

Right now, I've taken your advice and am ignoring the following errors:

Untrusted CA
Untrusted Root
Untrusted Test Root
CN Name Mismatch
Cert Expired

This leave only revocation, invalid cert use, and miscellaneous unlikely errors
to encounter after a successful handshake (not much).

Probably revocation is important, but log-diving shows a lot of self-signed and
expired certs used by legit MTA recipients. I can't figure out how to tell the
difference between a "real" untrusted root and a cert issued by some admin's
personal CA.

Jeffry



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