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Re: [ietf-822] utf8 messages

Mark Martinec <Mark.Martinec+ietf@ijs.si> Thu, 28 August 2014 08:46 UTC

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Date: Thu, 28 Aug 2014 10:46:08 +0200
From: Mark Martinec <Mark.Martinec+ietf@ijs.si>
To: ietf-822@ietf.org
Organization: Jozef Stefan Institute
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Subject: Re: [ietf-822] utf8 messages
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>> Mark Martinec <Mark.Martinec+ietf@ijs.si> wrote:
>> > It is not possible (even in the absence of SMTPUTF8 support) to be
>> > able to transfer e-mail messages with no out-of-band ("metadata" /
>> > envelope) information. The most obvious reason is the list of
>> > recipient addresses, which is not present in a message itself.

Tony Finch <dot@dotat.at> wrote:
>> That is what the BCC: header is for (before message submission,
>> if not at other times). [...]
>> I think it was a mistake not to specify in-header versions
>> of those directives.

In addition to what Ned Freed said, in case of mail forwarding
(alias/forward, not resent) where a transition MTA replaces one or more
recipient address with a new set, e.g. final mailbox destinations,
or replacing a role address with final recipients), there is no place
for mucking with Bcc or Cc or To header fields. These must remain
intact, just like with a passage of a message through a mailing list.

   Mark

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