Re: Cannot open my mail box.
It might be that you must be trying to log in with all capital letters. Means to say that you must be writing your email id and password with Caps Lock on.
Can you tell me which email client are you using? I would also like to know that which OS are you using?
Re: Cannot open my mail box.
Try to clear your browser history, cache, cookies and temporary files. Check out the internet connection, whether it gives you good ip address. If you still face the same problem try to contact your internet service provider for the help, he might be able to help you out