troubleshooting Question

Exchange 2003 multiple domain names error 550 5.7.1

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MohonkFlag for United States of America asked on
ExchangeEmail Servers
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I just installed an Exchange 2003 Server at a customers site.  They currently use their web hosting company with pop email accounts. The server is all setup and ready for the MX record change but I have yet to transfer it because I wanted to test out incomming mail first.  I have a few domains registered so I added thebron.com to the recpient policy and created a user with an email address for this site.  The MX recored has been transfered to the exchange server IP.  I can telnet into port 25 using mail.thebron.com.  I cant seem to successfully send email to the email address I setup.  I get the following error:

Sent <<< RCPT TO:<bron@thebron.com>
Received >>> 550 5.7.1 unable to relay for bron@thebron.com
Unable to deliver message to <bron@thebron.com>.

Is this because I dont have their main MX record transfered over to it yet which is how the server is setup?

Im using Road Runner with a Static IP.  Perhaps they are blocking incomming mail to my server?

Thanks for the help!
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