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Do you want email to always go out as @rest.com or just certain times? Is this for all users or just some users? Do you want replies to these emails to return to your system?

Thank y for answering.
I always want them to go out as @rest.com instead of @test.com and it´s for all users. I want the replies to return to my system.

Open System Manager and expand Recipients->Recipient Policies. Open the Properties Page of the Default Policy and go to the E-Mail Addresses (Policy) tab. Click New, choose SMTP Address and click OK. In the address field type @rest.com and click OK. Check the box beside the entry you just created, select ti and click the Set as Primary button. OK your way out.

You will also need to make sure the MX records for rest.com point to your Exchange server.

Thank y for answering.
I always want them to go out as @rest.com instead of @test.com and it´s for all users. I want the replies to return to my system.

Ok, does it works even if: @rest.com is a registered domain with it´s own exchangeserver, the @test.com company has been merged inte the @rest.com company but has to use it´s own exchangeserver, the mail just have to look like it´s coming from @rest.com. The MX record for @rest.com exists.  

Ok, does it works even if: @rest.com is a registered domain with it´s own exchangeserver, the @test.com company has been merged inte the @rest.com company but has to use it´s own exchangeserver, the mail just have to look like it´s coming from @rest.com. The MX record for @rest.com exists.  

Thank you very much, - F5.

/Effe