Have been using Thunderbird for over a month without any issues whatsoever. All of sudden it is not connecting to the mail servers and an error pops up that it can not connect to mail server. I can get mail on all my other devices, but not through Thunderbird. I can go to the email web browser and the email works fine. I have checked all my mail service setting on TB and everything is correct. Firewall settings have not changes and are allowing the mail to come through. What I can understand is why it is a on again and off again. This morning it would not connect for an hour. Now it is working fine. Other than looking at settings and going off line and then back on line, I have done nothing. I am attaching a screen shot of the errors and messages.