Craigslist email system not working?

I have tried to send and receive several emails through craigslist (the anonomyzer), and they don't go through. I know its not a typo from the poster because I have tried emailing myself through the boards. I really want to buy something, but I can't because the person's not getting my emails!! how do I contact this person if they don't post any other way to get a hold of them?