Created a new thread for this problem
Jan 7 15:30:03 trg postfix/smtpd[5298]: warning: hostname 177-92-185-104.xmaxtelecom.com.br does not resolve to address 177.92.185.104: Name or service not known
Jan 7 15:30:03 trg postfix/smtpd[5298]: connect from unknown[177.92.185.104]
Jan 7 15:30:03 trg dovecot: auth: Error: dlopen(/usr/lib64/dovecot/auth/libdriver_mysql.so) failed: /usr/lib64/dovecot/auth/libdriver_mysql.so: undefined symbol: net_str2port
Jan 7 15:30:03 trg dovecot: auth: Fatal: Unknown database driver ‘mysql’
Jan 7 15:30:03 trg dovecot: master: Error: service(auth): command startup failed, throttling for 60 secs
Jan 7 15:30:03 trg postfix/smtpd[5298]: fatal: no SASL authentication mechanisms
Jan 7 15:30:04 trg postfix/master[1125]: warning: process /usr/libexec/postfix/smtpd pid 5298 exit status 1
Jan 7 15:30:04 trg postfix/master[1125]: warning: /usr/libexec/postfix/smtpd: bad command startup – throttling
Jan 7 15:30:14 trg dovecot: imap-login: Warning: Auth process not responding, delayed sending initial response (greeting): user=<>, rip=::1, lip=::1, secured, session=
Jan 7 15:30:34 trg dovecot: imap-login: Error: Timeout waiting for handshake from auth server. my pid=5303, input bytes=0
Jan 7 15:30:34 trg dovecot: imap-login: Disconnected: Auth process broken (disconnected before auth was ready, waited 30 secs): user=<>, rip=::1, lip=::1, secured, session=