Am 28.08.2014 um 21:16 schrieb Leon Wei: > I setup a mail system with centos-postfix-dovecot, I can sent mail with > STARTTLS > in port 25, but SSL/TLS (port 993) doesn't work.
how is 993 related to SMTP or postfix? 993 is IMAP over SSL and your daemon listening on the port is most likely not a SMTP server SMTP over SSL is 465 and needs to be enabled in *master.cf* with "-o smtpd_tls_wrappermode=yes" which *must* not be enabled for STARTTLS ports 465 inet n - n - 60 smtpd -o smtpd_client_connection_count_limit=15 -o smtpd_client_connection_rate_limit=80 -o smtpd_sasl_auth_enable=yes -o smtpd_delay_reject=yes -o smtpd_client_restrictions=permit_sasl_authenticated,reject -o smtpd_relay_restrictions= -o smtpd_tls_wrappermode=yes -o max_idle=1800 -o max_use=500 -o syslog_name=postfix/smtps
