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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.

Thanks.
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joescorpio
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joescorpio
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1 Solution
 
Neil RussellTechnical Development LeadCommented:
With transport rules.

Hers an example of control, work with that as a model.

http://demazter.wordpress.com/2010/06/10/prevent-users-sending-external-e-mails-with-transport-rules/
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joescorpioAuthor Commented:
My case would be something like this:

abc.forest.com can email abc.forest.com
abc.forest.com cannot email xyz.forest.com
abc.forest.com cannot email external email

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

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

Now on the actions you can select for example
Send rejection message to sender with enhanced code. (E.g. "you cant email xyz.forest.com",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 @abc.forest.com.
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joescorpioAuthor Commented:
my abc.forest.com and xyz.forest.com also using the same @forest.com. How can I do an exception?
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