"peer's certificate has an invalid signature" in thunderbird

[Otto9999]

Hi. i have an issue with the new Kas. Premium.  having upgraded from Total i now cannot send any email out of thunderbird. system was fine before the new program installed, and it works if i pause or exit kaspersky.

Thunderbird reports error:  peer's certificate has an invalid signature

cannot find a setting that might help like in the old versions

since i use email all day, i now have no protection running.

As a reseller with 20 years of sales i am pretty unhappy with this latest product tbh, and would love to find an alternative

Edited October 29 by Otto9999

[Berny]

@Otto9999 Welcome.

Please disable temporary the encrypted connections  ?
 

https://support.kaspersky.com/help/Kaspersky/Win21.18/en-US/157530.htm

[harlan4096]

Also, You can try to do a different workaround:

 

Keep encrypted connections scan enabled, but add the email servers from Your account in ThunderBird, to Scan Encrypted Connections exclusions via Configure Trusted Addresses: