CentOS 7.x Enable submission 587 port for postfix

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Home > CentOS > CentOS 7.x > Email configuration > Postfix configuration > CentOS 7.x Enable submission 587 port for postfix

To enable Submission 587 port when TLS configuration for postfix for port 25 is already configured use:

  1. Edit /etc/postfix/master.cf
  2. Uncomment following lines:
    submission inet n - n - - smtpd
    -o syslog_name=postfix/submission
    -o smtpd_tls_security_level=encrypt
    -o smtpd_sasl_auth_enable=yes
    -o smtpd_reject_unlisted_recipient=no
    -o smtpd_recipient_restrictions=permit_sasl_authenticated,reje
  3. systemctl restart postfix
  4. netstat -alnp | grep 587
  5. To ensure that firewall is not blocking incoming connection to 587 try "telnet <server> 587" from a remote machine.


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