As youhave not provided much information, I am making some assumptions :-
Let's say :
Your domain is called : mydomain.com
Your SME server is configured with mydomain.com as the server domain name
Your actual homepage (
www.mydomain.com) is hosted by your ISP or another webhost
When you access your homepage from the internal network you probably got a page that said "This web site is under construction"
If the above 3 assumptions were true, then you will be able to access your homepage from anywhere on the internet except your LAN unless you go into server manager, under Hostnames and Addresses, change the www entry to point to a Remote host and configure its global IP to the IP address of your homepage (you can find out your homepage IP if you ping
www.mydomain.com from outside of your LAN).
If not, then post more info about your setup.
Kelvin