Fail2ban filter

Hi Guys,
Can anyone help with a fail2ban rule for this type of connection?
My log files are full of this type of junk, and I'm in no way a expert on regex syntax.

Code:

Sep 23 09:49:02 shadow dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=2402:b801:3873:a500:cd0c:5fe9:9652:98d3, lip=xxxx:d500:6:xxx::x, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<CELKQPsF7oYkArgBOHOlAM0MX+mWUpjT>
Sep 23 09:49:02 shadow dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=2402:b801:3873:a500:cd0c:5fe9:9652:98d3, lip=xxxx:d500:6:xxx::x, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<Oi7MQPsF9IYkArgBOHOlAM0MX+mWUpjT>
Sep 23 09:49:02 shadow dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=2402:b801:3873:a500:cd0c:5fe9:9652:98d3, lip=xxxx:d500:6:xxx::x, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<TY3NQPsF+oYkArgBOHOlAM0MX+mWUpjT>

Thanks,
Stephen