In <489058DA(_dot_)9070103(_at_)network-heretics(_dot_)com> Keith Moore
<moore(_at_)network-heretics(_dot_)com> writes:
I think it's rather odd that people are arguing that a proposed
extension to the 822 (i.e. user-to-user) protocol can only be used by
what is arguably mail transport (or on the boundary between transport
and the recipient's user agent). It certainly doesn't belong in SMTP.
Nor does it belong in a body part, since it's clearly a message-level
function.
Eh? That header has no meaning whatsoever for RFC 2821 transport. Its only
possible effects arise _after_ 'final delivery', at which point it is
sitting in some sort of 'mailbox' (be it IMAP, POP3, or Hector's grand
archive with alread-existing purging mechanisms). So the feature certainly
has to be in an RFC 2822 header, if it exists at all.
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