How do I set the default send domain in Exchange 2010

I can't seem to change the default sending domain from "domain.local" to "".
In the Exchange System Manager I created the "" as the default domain and created an email address policy for "" to be the highest priority.
Not sure if I have to do this in the Exchange Shell.  If so I can't seem to find the commands.
Any help would be appreciated.

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AkhaterSolutions ArchitectCommented:
if you added as accepted domain and you have created an email address policy for it and in this email address policy you did set the as reply address

Just right click on the address policy and click apply.

also make sure the clients have the "automatically update using email address policy" check box enabled.

It should work
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