I'm trying to remember if this has been suggested before, couldn't seem to find anything in the archives (probably bad search terms). How about a test similar to MAILFROM but it checks the intended recipients of all local domains and fails if any of them are invailid, ignoring the nobody alias. It could even return the count as weight or a multiplier of count as weight. I can't think of a reason legitimate mail will have more than a couple outside of a mailing list, which, if I'm remembering right, generally only uses single recipients.
It's a good idea, and something we will likely add. It would probably have occasional false positives for various reasons, but would make for a useful test.
-Scott
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