Does anyone know what the site's policy is on reporting abuse of the email system?

After a long time of the email system not working (reportedly due to blacklisting) it is back working and I get some immature douchebag sending an obscenity laced email through the YouPlayIt site. Adding irresponsibility to immaturity, he also includes obscenities in the subject line so that even my children can read it without having the preview pane open or opening the message.

Typically, this type of message can get reported to my ISP to have them take corrective action, but because it was done through YPI the site would get punished instead. Other than making private messages unavailable because of one douchebag (and his phantom accounts), is there anything that can be done to prevent this wanton abuse of the site's mail system?