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Michael GunnerFlag for Spain

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Unable to use Thunderbird

Thunderbird email client mails blocked by popup. I cannot access mails on Tbird because a pop-up appears saying I am about to alter how Tbird identifies this site. I have more than 10 accounts set up via my BlueHost Hosting system.The same popup occurs for all of them.  I can access all the mails using web mail rather than the Tbird client. I haven't any other client systems to access the mails.
The system has Spanish language and I attach a screen grab. The translation is: You are about to alter how Tbird identifies this site. It gives the server address mail.domainname.es:143
State of certificate
- This site is trying to identify itself with invalid information
The popup invites to accept security exception. If I press this it pops up again with a different domain name,

I have Avast Internet Security installed. If I look in detail Avast protections appear in what it calls Basic Shields.
Details of certificates:
Certificate of Server SSL
Domain Control Validated
Emited by
avast! Web/Mail Shield Root
generated by avast! antivirus for SSL/TLS scanning
It is beginning to look as if Avast is guilty overall. What would recommended cure be please?
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Jackie Man
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Uninstall Avast Internet Security, restart computer and try again.
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ASKER

Thank you. Your opinion backs up what I had thought. I am in the process of doing the uninstall (which is more complicated than I thought).
Apparently, Avast became a certificate authority service in 2016 and your host is on a long list of places that Avast is not happy with.  If uninstalling doesn't fix it, read this article on how to add an exception for your mail server:
https://support.mozilla.org/en-US/kb/add-security-exception
SOLUTION
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Merete
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I uninstalled Avast and unfortunately the problem remains with Thunderbird. I will look at the other steps suggested here but it will take me some time because I need mail and have to use a web mail which is cumbersome. I will not close the question as I have no answer that works yet. Thank you for your help.,
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There were other things suggested to try but I thought I really should remove a persistaent error which I thought was unrelated. Now it all workd but if th eproblem comes back I still have a couple of things to try which hve been suggested here. Many thanks