Thunderbird no longer accessing Gmail
Running TB 78.11.0 in Windows 10 21H1. Being running TB for years. Last couple of days no longer accessing Gmail when press Get Mail button get box saying Certificate not trusted and asking me to add a security exception. I have changed nothing in TB account settings or Gmail. Gmail messages accessable OK via web browser or iPad. Is anyone else seeing this, and any ideas of solution.
Solution choisie
I assume Avast support will be able to assist you in configuring their product to work.
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That sounds like your Anti-Virus could be forcing you to see that message, so click on add exception.
You normally never store a certificate for Gmail in the server tab.
In Account Settings' for the gmail account, click on 'End-To-end Encryption'. 'Manage S/MIME Certificates; opens 'Certificate Manager' click on 'Authorities' tab. You should see 'Google Internet Authority G2' under 'GeoTrust Inc'.
If you are using AVAST: Make sure Avast is up to date. Then try manually adding certificate. You may need to remove the stored one first. https://support.avast.com/en-ww/article/Troubleshoot-invalid-email-certificate
Alternatively: Switch off the Avast mail shield https://support.avast.com/en-ww/article/Antivirus-shield-settings
Or accept as security exception.
Thanks for information. I tried disabling Avast Mail Shield and problem disappeares. I also tried suggested path to export Mail Shield certificate from Avast and import into Thunderbird. This did not fix the issue.
Solution choisie
I assume Avast support will be able to assist you in configuring their product to work.