Thanks for the reply....
My Sametime server is set to Homer/Headoffice (which is on the owl server).
The only thing I can think of is that Tigger/Headoffice (on poohbear) has a HTTP service running for Internet Mail etc and it's forcing out it's domain over everything else.
I can just imagine the soloution is something so simple and it's probably staring me in the face.
Thanks again for the response........hope that helps you to help me :)