The question that started the discussion is the inconsistency of MUAs to
match local-part of a From: address to the local-part of an
rfc822Address SANs or email RDN component
That's one of them.
However--An *a priori* search of a key store is a niche case.
If you will review at least a hundred recent messages on the ietf general
list about draft-ietf-dane-openpgpkey, you will find that opinion is not
universally shared.
First, outside an enterprise there is no global directory, so there's no
place to search anyway. You're much more likely to exchange unsigned
emails first.
For PGP keys, there certainly is a global directory, albeit rather
incomplete, and the draft I mentioned above purports to put such a
directory into the DNS.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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