Hi, Mike! Perhaps you could also add something to the "Post a Response" screen -- you know, where you ask for the poster's name, e-mail, and subject? Some people may think they're required to give their e-mail addy, or their posting won't "take".
If you could put the word "optional" in parenthenses after the e-mail request, then that might clear things up a bit. :)
-- Nanaea