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Re: [ietf-smtp] another attempt to canonicalize local parts

2016-03-10 04:28:55
Agree that the SMTP servers could be a reasonable approach.  Others might
be to declare some sort of canonicalization rule or matching regex in the

Enumerating canonicalizations is hopeless for reasons already discussed, but Regex is an interesting idea, although it quickly takes you back to the question of what assertion the certificate is making. At this point, the places signing S/MIME certs just check that the applicant reads mail at the address in the cert by sending it a link. But what does that mean with a regex? How do you check that the addresses it matches all map to the same mailbox? Sometimes you can enumerate the addresses a regex matches (these are all me):


sometimes you can in principle but not in practice:


sometimes you can't even try although you could use heuristics


but how do you allow those but not this one?



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