IIRC, paulsingh created something similar (Philtro?) a while back. The focus was a little bit different--it acted as a spam filter--but I think you could defini

IIRC, paulsingh created something similar (Philtro?) a while back. The focus was a little bit different--it acted as a spam filter--but I think you could definitely benefit from his knowledge. Good luck! EDIT: It appears philtro was acquired back in 2009. He may not be able to speak freely about the service because of it, but that does certainly help validate your market.