The server of the Bellsouth Email account may be down or crashed.
Check to see if your Internet connection is too slow or if your Internet connection isn't good enough to connect to the Bellsouth email server.
Your login credentials, especially the password for your Bellsouth email account, are incorrect.
You are using an out-of-date web browser.
These are the best ways to fix Bellsouth email login issues.
See Also this post:- http://datarecovo.populr.me/how-to-configure-bellsouth-email-settings-for-outlook