Hi, I've setup for 1st time in my life a Debian (limited knowledge with linux) server with Sendmail/Dovecot. Everything is working fine, receiving/sending mails locally and remotely. Loging working fine on webmin/usermin/virtualmin but every e-mail client fails to authenticate. Thunderbird gives me error that username or password is not correct and other clients on mobile that "unable to connect to server 3011" or "cannot connect to server 3014". All ports are open and checked Telnet: Code: telnet 1.1.1.1 143 Trying 1.1.1.1... Connected to 1.1.1.1. Escape character is '^]'. Connection closed by foreign host. /var/log/mail.log Code: PORT 993-> Jan 3 11:32:28 sd-41781 dovecot: imap-login: Disconnected (disconnected before greeting, waited 0 secs): user=<>, rip=HOME-IP, lip=SERVER-IP, TLS handshaking: SSL_accept() failed: error:140A1175:SSL routines:SSL_BYTES_TO_CIPHER_LIST:inappropriate fallback, session=<l9RV+bwLtwBeRjvU> PORT 993-> Jan 3 11:33:18 sd-41781 dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=HOME-IP, lip=SERVER-IP, TLS handshaking: SSL_accept() failed: error:140A1175:SSL routines:SSL_BYTES_TO_CIPHER_LIST:inappropriate fallback, session=<nvlT/LwLxQBeRjvU> PORT 143-> Jan 3 11:33:50 sd-41781 dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=HOME-IP, lip=SERVER-IP, session=<R1k3/rwLzQBeRjvU> I've tried many "workarounds" around the web and this forum but I Can't find a solution