Home > SMTP delivery direct to your mailserver (Primary MX). > How to configure direct SMTP
There are many different mailserver software packages available so methods for configuring your server vary somewhat. Therefore we are unable to detail how you configure each application here. If you find that you are not able to configure your mailserver for direct SMTP then you should enlist the help of a 3rd party IT consultancy firm who will be able to help you out.
If you are running your mailserver through a NATed connection then you should remember to configure port forwarding for port 25 on your router to the private IP address of your mailserver.
To determine whether you are using NAT or not – look up the IP address of your server and it this address is in one of the following ranges then you are using NAT: