Viktor Dukhovni writes:
The internal mailstore topology is none of the sender's concern, but
also I do not wish to be a source of backscatter if the envelope sender
address is fake.
Suppressing DSNs won't entirely prevent that. For whatever reason the
internal mail server may end up bouncing it. The edge server, having
accepted it and rewritten the recipient address has no guarantees that the
rewritten recipient's address is deliverable. So it can still bounce and can
generate backscatter.
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