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Re: First strawman for UTF-8 headers proposal


At 10:33 AM +0100 11/28/03, Thomas Roessler wrote:
On 2003-11-26 10:57:57 -0800, Paul Hoffman / IMC wrote:

 - If a receiving SMTP server does not support UTF-8-HEADERS, the
 sending SMTP client downgrades all headers and continues to send
 the message.

...

 - If the initiator knows the mapping for any recipient (through caching
 or an address book), they SHOULD put it in the map header. If they
 don't include a mapping and the message hits a non-UTF-8-HEADERS
 SMTP server, the message will bounce.


What happens to the envelope?  I'm reading the current proposal to
mean that mail transfer agents would have to rewrite the envelope
based on parsing the address-map header in the message, and bounce
if no address-map is present.

That was my intention, yes.

What to do about BCCs, then?  Adapted mapping headers for each
instance, in order to avoid information leakage?

The originating client would just do their own local fallback. If none is available, the message doesn't get sent.

Yes, we would need to deal with Bcc handling carefully.

I'm also having some doubts about what will happen when messages are
sent to mixed universe (utf8/non-utf8) recipient set (or are
automatically bounced to systems outside utf8 universe; think
webmail systems).  I'll try to elaborate on this later today.

Please do. I didn't see a problem with this in my first guesses, but I easily could have missed something.

--Paul Hoffman, Director
--Internet Mail Consortium