exchange 2003 and 2 diffrent domain

my company has own domain name( and my friend has his own domain name( we decided  
working together .

we plan only one exchange server using for our business ,But i do not know how i will configure exchange that get mails from 2 diffrent domainname.

or other idea?
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fairly simple you would define the domains as local on your server while the configuration of users with the email address/es that their mailbox will receive.

your limit will deal with how many users your exchange can support in total.

Here is an MS example of the situation you find yourself in:

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