So you are facing not working issue with Thunderbird email and looking for a solution. It is quite a critical but frequently occurring issue that you can fix this with these steps:
·        Check your internet connection, and make sure it is working fine.
·        Next, you should verify the outgoing server and incoming server email settings.
·        You should also check your password if you enter the correct one.
·        If you find that Thunderbird email is getting interrupted by the third-party antivirus software, then you need to turn it off for a while.
·        Next, restart your computer and try to open Thunderbird account again.
If you are not getting satisfied with this solution, then you should call at Thunderbird contact numberand get the prominent solution.