It's hard to say because the entire idea of defining a general
"canonicalization" operation for email address as a solution for various
problems is, as I have previously pointed out, nonsensical. ...
Perhaps a way of thinking about this is whether identity equivalence rules
of a domain can specified and then communicated to a third party so that
the third party can make its own judgement about identity of the purported
sender of some email. At a high level can a specification be made assuming
that the domain makes it suitable to do so?
Probably not, for all the reasons discussed before.
Moreover, I don't understand what problem this is solving. If it's my
S/MIME key and my MUA, why wouldn't I put the same address in the key that
my MUA puts in the From: line?
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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