Re: why you shouldn't even try to canonicalize local parts

> 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.

R's,
John

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