I understand them sending from multiple IPs (which gives them a lot of advantages), but I haven't yet seen a single spammer that would try to relay through a server that doesn't allow relaying.> Otherwise, why would the spammer try to relay through a server that > doesn't allow relaying?There must be some really stupid new spammers out there that think using the same analogy as "the more IP addresses you send from, the more RBL filters you'll get around" becomes "If I try often enough, a small % will slip through." There are more and more pointless relay attempts recently.
By that, of course, I refer to a case like this where the spammer is trying to send tons of E-mails through a mailserver that is not an open relay (they will often try individual E-mails, to test whether or not a mailserver is an open relay).
-Scott
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