Fehlermeldung
Kombination ISPConfig und Letsencrypt
Oct 27 09:33:36 example dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=***.**.***.***, lip=**.***.**.**, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert number 46, session=<qO5twtM/IgV8F2vF>
Lösung
In /etc/dovecot/dovecot.conf
ssl_cert = </etc/letsencrypt/live/example.com/fullchain.pem
ssl_key = </etc/letsencrypt/live/example.com/privkey.pem