===== UPDATE 7/7/2022 =======
As of today, the Security Certificate exception has gone away.
I’ll keep this report here, just in case it reappears.
I’ve been receiving a Security Exception issue with Avast and the recent Thunderbird mail Clients whenever I hit the “Get Messages” button for my hotmail email accounts.
http://SecurityException.PNG
← I’ve added the popup as an attachment.
It keeps coming back, even if I select “Confirm Security Exception” upon the popup. The reported error is “Unknown Identity” and when I view the Certificate details, the Issuer name is shown as “Avast Web/Mail Shield”.
Disabling the Mail Shields’ "Scan Inbound emails (POP3, IMAP4) addresses this problem, but I guess exposes my mail client to undetected viruses/malware.
Any idea, why this is happening ?
Thanks in advance,