While the OP was trying to gather elusive details on his spammers IP in the original post, I figure this might help shed some light on what exact site is all too often responsible for the specific spam emails that we all get from time to time after filling out forms on allegedly secure & seemingly legitimate websites.

http://www.hedir.com/introduction/a...

How To Ask Questions The Smart Way

"Now whats cool is if you search Gmail for username+samplesitecom"

uh... ?

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If at first you don't succeed, you're about average.

M2

also people that use IntelliMail, and other smiley mail add ons,
are giving away email addresses to spammers.
and most any "send this to someone by entering their email here" is adding to your spam.
I had a clean inbox before getting email from someone with intellimail add ons.

Incredimail was the name of it.
a spam engine for sure. harvests all email addresses used with it.