Wondering why I am no longer receiving mail in Apple Mail.app. I have checked the settings, and every other thing I can think to do. I know the account is active because I can go to webmail and get the email.
So, in the left column, next to the word Inbox, is there a circle icon with a triangle or lightning bolt inside it? If so, click that, and take the account online. Then click Get Mail. Tell me if you get any errors.
I was also having a problem with continually having to put in my password on the other accounts.
It would be worth it to open Keychain Access and see if your keychain is unlocked. One should also periodically run "Keychain First Aid" from the application menu (the one next to the Apple menu that changes its name depending on what app you're in).