Email forwarding

We have acquired a small company running exchange 2003.  I am also running exchange 2003.  I have created usernames and email accounts on my end for the new users. I will export the new users old email and import them to my servers using exmerge.  I would like to know how can I ensure that their email that was going to them at domain A gets forwarded to my domain B.  Please provide me with any changes I have to make on their outside DNS, MX records etc.  
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FOXActive Directory/Exchange EngineerAsked:
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You need to update the MX records to point to your server, and then wait a while until it propigates across the internet. Also on your external DNS of the new company domain, you should update the PTR record to point to the internet address of your exchange server so reverse dns is working.

That should be it!

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