Gmail: Alert for Inability to Connect to POP Accounts

When you get a Gmail account, it's great to be able to download emails from other accounts using POP. But for many people, they are forced to change their passwords by their school/work/security setup. But, when Gmail can no longer access your account, it doesn't act any differently. It wont notify you. In fact, it just says that there is no new mail from the account. There needs to be a notification that google can no longer access the old account, and is no longer retrieving emails via POP.