Dave Platt writes:
Unless I'm missing something, a 45x temporary-error reply at the completion of the DATA phase is both reasonable and acceptable under RFC 2821. If that is indeed the case, then I would appeal to Sam to roll a change into the next version of Courier to actually permit smtpfilter scripts to echo back a 45x error code, just as the rcptfilter scripts can already do.
And one of the two recipients of the same message will now be able to prevent the other guy from getting his mail.
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