I have a new problem I have never had before. All of a sudden when I go into Outlook Express it asks me for a username and password for my mail account. When I switch identities to my other accounts, I am able to retrieve and send with no problems. I don't know what happened. The settings are the same. What do I do? Can anyone help me? I tried different usernames and passwords that I may have chosen but I never had to use it before so I don't remember. Below is the error I keep getting.

There was a problem logging onto your mail server. Your Password was rejected. Account: 'mail.optonline.net', Server: 'mail.optonline.net', Protocol: POP3, Server Response: '-ERR [AUTH] Authentication failed', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC92