It appears that Viktor Dukhovni <ietf-smtp(_at_)ietf(_dot_)org> said:
The "Delivered-To" address is an internal representation of the target
mailbox (for loop detection), and is not intended for consumption by
MUAs or tools like fetchmail.
This is a key point. The experiment draft doesn't match current practice,
and would at best lead to needlessly incompatible MTAs.
qmail's internal representation is different from Postfix's, but it also
is often not the same as any envelope address.
R's,
John
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