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From: Wietse Venema (wietseporcupine.org)
Date: Tue Mar 12 2002 - 10:05:09 CST
> As for clients that don't queue, who has those still?
A lot of spammers, in fact, never queue. I am going to try to make
it an UCE feature. If mail comes from a never-seen-before
client/sender/recipient tuple, tell them to come back in an hour
or so. If they don't come back, the mail was almost certainly junk.
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