Define new address domain mail as default for exchange 2010 user

Hi there,
The actual domain name for exchange address domain is @myfirstdomain.com
In addition, We would like to use a new domain as new default adress for user @mynewdomain.com
If someone send a mail to mail to old address domain @myfirstdomain.com, it must continue to work.
Please me to configure this on my exchange 2010 server.
Thanks,
Regards,
simlipAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
take a look here on adding an additional domain in exchange

http://www.petri.co.il/configure-exchange-2010-receive-email-external-domains.htm

this will help with the address policy so you can add the new domain for users while at the same time still accept mail for smtp addresses on the old domain

http://exchangeserverpro.com/exchange-server-2010-email-address-policies/

also make sure your MX records for the new domain are setup point to the same location as your current domain
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