Start All Services

The final steps is to Starting Up All Postfix Services

$/usr/local/sbin/postfix start
postfix/postfix-script: starting the Postfix mail system
$/usr/src/etc/rc.d/inetd restart
Starting inetd.
$/usr/local/etc/rc.d/courier-authdaemond start
Starting courier_authdaemond.
$/usr/local/etc/rc.d/courier-imap-imapd start
Starting courier-imap-imapd.
$/usr/local/etc/rc.d/courier-imap-imapd-ssl start
Starting courier-imap-imapd-ssl.
$/usr/local/etc/rc.d/courier-imap-pop3d start
Starting courier-imap-pop3d.
$/usr/local/etc/rc.d/courier-imap-pop3d-ssl start
Starting courier-imap-pop3d-ssl.

After all services Start successfully.
You can try to send/receive email from webmail or others mail client.
IF you experiencing the problem with this guide.
Please feel free to contact us with the error so we can help you troubleshoot more faster.