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Re: [ietf-smtp] why you shouldn't even try to canonicalize local parts

2016-03-15 18:28:23
Another idea in the opposite direction:

A local-part fix up might be to use RFC7508 encrypted headers to repair the
FROM and SENDER email addresses to their canonical form.

If you mean the canonicalization rules in section 4.3, they're borrowed from DKIM and only change white space. It also references RFC 5750 which says that

      Receiving agents MUST check that the address in the
   From or Sender header of a mail message matches an Internet mail
   address, if present, in the signer's certificate, if mail addresses
   are present in the certificate.

but it doesn't say what "matches" means.


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