Mark Martinec <Mark(_dot_)Martinec+ietf(_at_)ijs(_dot_)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.
That is what the BCC: header is for (before message submission, if not
at other times).
Envelope sender may or may not be present in a mail header
(as a Return-Path header field).
Right.
Other examples are RFC 3461 data (RET, ENVID, NOTIFY, ORCPT).
I think it was a mistake not to specify in-header versions of those
directives.
Tony.
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