Very simple really.
There are sponsors who will sell their webmasters email address that spammers then use as return or sending address for their spam.
Most ISP can see that you did not send those emails, but imagine that you have some retards as tech guy who gets a complaints from Bible Joe of Buttfuck Nebraska because Bible Joe got a cp email. Your retarded tech guy will then forward the email to the cops who are even dumber than postmen (Usually if you can't make the post office exam, you go to the police academy). The cops gets a warrant from Emily "I pray the Virgin Mary" judge, the cops show up at your house, they check your PC and find a few pics of 35 years old teen that you bought online.
Congratulatons, you just landed in a whole load of shit and trouble...
Seems farefetched? Ask Mike Connely of Lansford, Indiana who was arrested because of the megarotic spam campaign...
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