btw, I really doubt that the now-common high %age of mgs to unknown recipients is address harvesting/dictionary attacks.
Rather, I think spammers are blindly hosing out all the crap they can to all the domains/MXs and whatever IPs are listening on port 25 that they can find.
My theory is that they are either doing that, or they previously did a dictionary attack when a "nobody" alias existed, and assumed all those addresses really did exist.
-Scott
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