If you can there is obviously nothing wrong with your password or account hence the advice to do nothing. The first thing to do when it happens is check to see if you can log on to your email account via a web browser. It is also recommended that you do not change passwords or delete the account from your device as that can cause more problems than it solves. It was probably BT server problem that stopped your emails and when it happens the usual advice is to do nothing because it normally resolves its self in a day or two.
