Sending Mail to user with same domain that don't exsist on SBS 2011 network

I have just setup a new install of SBS 2011, I have users within the organisation who are not on this setup but use the same domain name when I email them it bounces as non exsistant domain, I knew how to change this in SBS 2003 but not sure on the new setup.

Any ideas?
Daniel ForresterDirectorAsked:
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The steps you need to follow are (roughly) described here - basically in Organization Configuration --> Accepted Domains, find the domain in question and make it an "Internal Relay Domain" rather than an "Authoritative" domain.
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