Thunderbird was working up until 11/14/2020. Now it wont connect to att.net. Dont know if an update reset connectivity. Called ATT for assistance and they confirmed that the email is working on their end. They then walked me thru the settings for Thunderbird, still not connecting. What is going on? Need help. Giving an error message" Login to server outbound.att.net with user name email failed Please try again later"