Have his email address? Probably free email? You can send them a copy of the email, show them that he is engaging in illegal activity (extortion, conspiracy, etc.) and ask for a log of his login IP addresses and possibly his computer name... If you only get the IP, then you can do an LOOKUP on the IP to get the domain he is logging from. Unless he's using an anonymizer... you should be able to track him down to who he is logging on as and what internet provider. It doesn't help much if you track him down to a netzero account or some such... but it might be a place to start. His email is evidence in possible extortion charges, conspiracy, felony copyright violation, etc. Of course... unless you can track him down... it does you no good. =( Good luck!