In general I agree but there are still situations where an MTA (mine
for example) accepts a message intending to forward it somewhere else
and then the forward fails. Either send a DSN or drop it on the floor
at that point.
Well, yes. You take ownership of that message by the act of forwarding, you
now own it, from the point of forwarding. If you don't want to disclose the
forwarded-to address, that's your responsibility, so either set the sender's
address to <>, or to some other address where you want the bounces to go.
Huh? If I send a DSN it includes the original delivery address but it
doesn't have to include the forwarded-to address.
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