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Re: [ietf-smtp] DSNs

2020-05-05 19:10:03
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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