>>I would like this problem corrected immediately. Thank you.<<
How about providing some actual information we can use?
What plugins are you using to moderate? (and 2.0.2?!? Upgrade man. You *need* to. 2.0.10 has all the security fixes you'll need for the 2.0 series. *That* could be an issue right there.) What browser are *they* using? Do you have the right email address entered?
There's all *kinds* of things that could be going wrong. Just saying something isn't working isn't going to get you much help, because it could be *anything* from the end user being a complete idiot and not doing something right, to your server being down, to ...well *anything*. The possibilities are endless.
Help us to help you. Otherwise, this is gonna be another unanswered question sitting in the forums.