The interaction of this with downgrading as specified in RFC 6857 and RFC
6868 is ... interesting.
Anyway, I guesss I'm going to have to teach my downgrade code how to process
Authentication-Results fields one way or the other. Oh well.
I wouldn't try too hard. By the time a message is hitting POP or IMAP
downgrades, I would think that anything that's going to use the A-R would
already have done its thing, and anything you'll lose by eliding a mailbox
local part isn't very important.
So this is a new case for the RFC 6857 approach. I guess we could opt
for an encoded-word ;-)
I just spent a week in China trying to explain to people that there is no
way to downgrade a UTF-8 local part so don't even try. The word
"punycode" was frequently uttered and as frequently stomped on.
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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