My customer use iphone login keyhelp mail server will failed.The error log is:
I search google it's recommend edit dovecot tls version.TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown
ssl_min_protocol = TLSv1.1/etc/dovecot/conf/ssl.conf
Please check it and edit it if it's need change.Thanks a lot.