I want to block outgoing mail to outside domain of single user in exchange

I want to block outgoing mail to outside domain of single user in exchange.my manager ask me to block outgoing of single user to outside domain.He can be able to send to our local domain....
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If you want to block the user from sending emails to outside your domain remove all the SMTP email addresses from his account and just leave the X400 email addresses.
Ehab SalemIT ManagerCommented:
This link will do the required:

Make sure to reatart the mentioned services (SMTP,...)

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om1999Author Commented:
its gives error saysing  cannot remove as its primary address
u can tick "authenticated users"
Open the Properties of the user in Active Directory Users and Computers and click on the tab "Exchange General", then the button "Delivery Restrictions".
In there you can restrict who can deliver to the user.
At the minimum set the "From Authenticated Users Only".

This would allow him only send mail to ur domain only....

Ehab SalemIT ManagerCommented:
To restrict a user from sending internet mail while being able to send internal mail, as far as I know, there is only one, and one way.
Please see my posting above.
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