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Email server TLS version
Where can I find out what tls version FQ has in place for the email servers? I use thunderbird client through a putty connection. I upgraded TB to version 78 from 68 then I could not send or receive email. It took me a long time to get it working. I upgraded to TB version 92 and still did not work but I would sometimes get an error message from TB about security issues. Turns out the newer versions of TB will not connect to servers with older tls versions. It was necessary to change the configuration of TB's "security.tls.version.min" setting from 3 to 1 in the preferences, then I was able to get email to work. TB recommends a tls version of 1.2, below is a copy/paste of the article I found on TB's help page.
After upgrading to Thunderbird 78, I cannot receive or send email messages.
One reason why this might happen is your email provider is still using very outdated security protocols. Thunderbird is serious about protecting the privacy and security of your communications, so by default, Thunderbird 78 will not connect to servers that do not support the modern (over ten years old) TLS 1.2 connection security protocol. If your email provider only supports the outdated security protocols TLS 1.0 or TLS 1.1, then downloading (receiving) and sending emails will not work. If you need to connect to mail servers with outdated security, or if you want to check if this is the cause of your problem, you can temporarily re-enable the older security protocols in Thunderbird settings using the process below. If you still have difficulties after trying TLS changes, or you know your mail servers support TLS 1.2, see:
Cannot send messages
Cannot receive messages
How to enable outdated security protocols TLS 1.0 and 1.1
Open Config Editor (about:config)
≡ > Options > Find in Options
In the searchbox, type: about:config, then press Enter.
Click on the button Config Editor… in the search result.
In the about:config dialog, search for: security.tls.version.min
Double-click on the found preference security.tls.version.min and change its value to 1, then press Enter.
Restart Thunderbird and try to download your messages.
If you can receive and/or send your messages after changing this preference:
Please inform your email provider to upgrade the security protocols on the server to support TLS 1.2.
Revert the preference security.tls.version.min to its original value as soon as possible by repeating the above procedure, then right-click on the preference and choose Reset from the context menu.
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