If you want to post your domain name, I'd be happy to have a look and see if there's anything obvious causing the problem. The tools others have listed here sho

If you want to post your domain name, I'd be happy to have a look and see if there's anything obvious causing the problem. The tools others have listed here should give you at least enough information to know where to start. Do you pay for google apps? If so, go into the help section - there's a 1800# to call for tech support. Depending on what the problem is, they may or may not be able to fix it (if it's not a google problem), but I would be shocked if they weren't able to tell you why this is happening. (if you don't pay for google apps, it might be worth paying, for the tech support).