First, copy the smtp_psa file. cp /etc/xinetd.d/smtp_psa /etc/xinetd.d/smtp_additional Edit the newly copied file and replace the first line. Replace 'service smtp' with 'service submission' vi /etc/xinetd.d/smtp_additional Restart xinetd.d service xinetd restart Check that port 587 is listening on the server netstat -ltnp
