I was going on a desireable assumption that a verifier would add a
Authenticated-Results header field and online/offline MUAs could
depend on this if it falls within the right domain or its domain is
accepted by a user.
You are aware, I hope, that nothing in an Authenticated-Results header
has any relevance to the authenticity or lack thereof of anything in a
message's From: line?
Really, S/MIME does what you want.
R's,
John
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