Nothing you can do to stop it man.. it will keep coming I learned that along time ago and there is a reason for it. you have any idea what the income potential there is in mailing alot more than there will ever be for adult that is for sure.
and if they have a BP server in china good luck even touching them. its very easy to mask your self in this business so no one will ever find you.
and Now that SPAM is Legal to send with the new Can Spam rules life is much better for us that already follow the rules and your email box as well
Spam is a way of life just delete it and move on