DNS Resolve

I got a win2k server with a domain let say group.com

I had registered the domain www.group.com and had registered e-mail and website on other company let say at “featureprice.com”. Now my website and e-mail is control by them and is running smoothly.

Now i got a problem.. my server dns is let say 192.168.0.1 and if all my workstation set to dns as that ip. it can view all website except my website and e-mail is not running.

Is it due to conflicts and other settings to help me??