Re: [ietf-smtp] Fwd: I-D Action: draft-melnikov-smtp-metadata-00.txt

["John Levine" <[e-mail]>]

In article <[e-mail]> you write:
>The problem with BINARYMIME is that unless everyone supports it, someone
>may have to transform the message... and that will break DKIM signatures
>and make life annoying.  Hence my colleagues question about a mime aware
>dkim canonicalization format as a pre-req for binarymime.

We considered it when we were doing the strict/loose c14n but decided
against it as a swamp.  If a relay is going to change MIME structures,
it can recode parts and reorder them while keeping the "same" contents
which will make it quite a challenge to describe what one has to do to
put them into canonical form.

There is a c14n registry to which new values can be added, so if you
want to propose a MIME c14n, the first step is to write it up in a draft.

R's,
John