oes anybody know of a way this can be done?.
The best way "system wide" is not to let the crap get down the wires and into the mailbox server in the first place, by rejecting (not bounce) at an anti-spam MX gateway.
You should never accept and then bounce what you reject (you become part of the problem, not part of the solution).
I don't "silently discard" on IMGate, other than episodes such as a mailer worm storm.
Rejecting mail after RCPT TO: is highly effective and accurate, plus most efficient for your systems, and all of Internet.
And don't buy any BS and FUD about "high reject rates of legit mail" when doing envelope-rejection.
Len
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