Oh, you might want to mess with his head.......
Tell him
your posts are not allowed to be posted on
his computer anymore, because he's a moron and you find it offensive that he gets to read your stuff. His ISP newsserver gets the feed the same way your site gets the feed. Ask him how he plans to get his ISP to either a)stop carrying the group altogether in case it violates your intellectual property, or b)screen out your posts before they hit his computer. Can't be done can it?
The newsgroup has bugger all to do with his ISP and if he only wants certain sites to see his messages, then he better stop posting to usenet. Posts are archived and every post he's ever made will be available to
anyone for years. Heh go to your group on google and use their search function.