Ugh....Lol.
Does this message come up when you're submitting information through a form on your site? If so, it's because the form 'action' isn't set up right...I don't really know how to do this...But I know it never works with forms that the information isn't run through a different website...(ie. Freewebs form creator send the information to freewebs, who sends it to your email) Don't know how much that made sense, but I hope you get something out of it.