We have two Exchange 5.5 servers. They are *supposedly* protected by some
sort of a pre-filter (we do seem to be blocking emails from sources which
don't match up the RDNS.) However, one of the mail servers seems to be
routing a LOT of spam. On the other hand, it's not an open relay, as I've
run most of the open-relay checks and none of them come up with a "hit."
The only thing I can think of, possibly, is that someone has a compromised
machine which is being used to relay spam through our Exchange server. If
that's the case, I don't know how I'd detect what machine is compromised and
fix it...
Any suggestions?
Thanks
John
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