How to create permission to allow sending to only a specific domain in Exchange 2010

On Exchange 2010, can anyone help me point on how to setup certain mailbox to be allowed to send to specific domain. My organization has a large forest and I am in one of the child domain. I do not want user in my child domain to be able to send out to other domain and also to an external email.

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Neil RussellTechnical Development LeadCommented:
With transport rules.

Hers an example of control, work with that as a model.
joescorpioAuthor Commented:
My case would be something like this: can email cannot email cannot email external email

How could I do it on transport rules?
Neil RussellTechnical Development LeadCommented:
You would control it by using the following conditions....

When the From Address matches text Patterns  ( Set pattern to when is the sender)
When a recipient's properties match text pattern. (e.g. Property EMAIL: Text pattern

Now on the actions you can select for example
Send rejection message to sender with enhanced code. (E.g. "you cant email",5.7.999)

Hope that gets you on the right track.

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joescorpioAuthor Commented:
Neilsr: What your suggestion is actually will reject all message from
joescorpioAuthor Commented:
my and also using the same How can I do an exception?
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