----- Original Message ----- > From: "Murray S. Kucherawy" <superu...@gmail.com>
> So, maybe a header canonicalization that has as one of its steps conversion > of all Subject fields to something RFC2047-compatible? > On Tue, Mar 24, 2015 at 1:39 PM, John Bucy < jb...@google.com > wrote: > > The scenario I had in mind was: > > > - B advertises SMTPUTF8 but relays to C which does not > > > - A sends a message to B with an unencoded utf8 Subject: invoking the > > SMTPUTF8 extension > > > - B could opt to encode the Subject: header using rfc2047 to produce a > > message acceptable to C > No, the EAI RFC is clear, if the MTA (B) cannot send it as is, you MUST bounce it. remember EAI does not offer any downgrade capability at the MTA level (by design).
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