ISPs and Spam Enforcement...

mathowie asks: "I've been getting spams from "Benchmark Printing Supplies" for over two years, and I see an Atlanta-based PSInet dialup in the headers every single time. My messages to PSInet's abuse team asking why have gone unanswered every time. How can we stop spammers if ISPs don't take strong steps to hinder these guys from profitability?" Where CAN you go next if your ISP refuses to do something about the growing amount of SPAM in your inbox?