> ...one of the most frequent IPAddress Strings that shows up, is from
> the following domain...xo.com

XO  is  a  giant ISP, one of at least 6 ISPs providing connectivity to
the same spammers:

http://spamhaus.org/SBL/sbl.lasso?query=SBL5056.

Rather than chasing down entire /24s yourself, which is prone to error
and  frequent change, you'll be much better off using some kind of RBL
query  (Declude,  IMGate,  etc.). I admire your efforts in this arena,
but for a few bucks you could have software do much of this for you.

-Sandy


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