This bug was initially created as a copy of Bug #2229981 I am copying this bug because: Description of problem: TLS is broken on the latest thunderbird release Version-Release number of selected component (if applicable): thunderbird-102.14.0-1.el7_9.x86_64 How reproducible: Always Steps to Reproduce: 1. Configure thunderbird to use TLS for pop3 or smtp connections 2. Update thunderbird to 102.14.0-1.el7_9.x86_64 3. Launch thunderbird and attempt tls connection Actual results: TLS connection fails with the following entry in maillog: Aug 7 19:06:15 mail_server dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=192.168.0.1, lip=192.168.0.1, TLS handshaking: SSL_accept() failed: error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate: SSL alert number 42, session=<ddk1GlkCBqjAqAAB> Expected results: tls connections work as expected Additional info: Downgrading to thunderbird-102.13.0-2.el7_9.x86_64 fixes the issue Disabling SSL/TLS security and sending authentication in plain text (highly undesirable) also works TLS cert is self signed and imported into thunderbird, with expiry date 2028