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Re: [ietf-smtp] Address transformations

2016-07-31 08:36:15
That means --as examples, not a comprehensive list-- that relays
MUST NOT alter: ...

-- The domain-part, even to substitute names that are
      believed to be equivalent, convert from A-labels and
      U-labels or back (or to try to substitute "variants" or
      apply case or other mappings, including normalization)

How about resolving CNAMEs?  That's been kind of ambigous in the past,
particularly back when there was a widespread assumption that CNAMEs
were just temporary forwards while people updated their address books
and bookmarks.


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