I have an exchange5.5 and recieving emai

with my original domain @example1.com i’ve just recently registerd a new domain @example2.com and updated the mx record i check the que and see the example2.com mail has arrived but is not routing it to the mailbox.

Is it possible to have two domain names on one exchange box? Add added a route to example2 in the IMS. I try to force the send and get an error message of “network error during host resolution” any sugggestion guys?