Hmm, any reason that you need to accept and then black-hole the message, instead of answering 550 right up front? Rejecting while you still have the sender on the phone means you don't have to generate a new NDR. Most spammers won't bother to NDR themselves, they just move on to the next target.
It requires a patch to qmail and a cdb database of valid e-mail addresses. Doing it this way is the path of least resistance, but I'll probably end up doing that eventually.
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