Today Bitdefender updated itself and invalidated Thunderbird email certificates for all my email accounts! I have been using Bitdefender for over a month and never had such an issue until now.
Thunderbird notification popup says exactly this: The certificate for imap.googlemail.com does not come from a trusted source.
If i go to Protection>Online Threat Prevention and disable Encrypted web scan option then Thunderbird doesnt complain anymore. But this is not a solution!
Please let me know how to fix this issue. Many Thanks!