Exchange 2003 SMTP Connector

I have a customer who have a feature in the new VoIP/Voicemail server that allows the server to send us emails of the voicemails that are left for us. We'd like to set it up so that the Voicemail server can forward those emails directly to our email server, rather than sending them out to a generic Allworx account then back into our server. We are getting funky Undeliverable messages with that service.
Allworx says this can be done by pointing the Voicemail server to our email server using a Smart Host Address and Smart Host Port 25.
 
So, my question is, how do I setup this Smart Host feature on a Exchange 2003 Server?  Is this really a SMTP connector?  How does the authentication work? Can this be setup so it won't interfere with normal email flow?

Thank You
leoedwardsAsked:
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mds-cosConnect With a Mentor Commented:
25 is the standard SMTP address.  The only thing you should need to do at your Exchange server is go into settings on the SMTP connector an allow relay from the address of the voicemail server (you could allow relay from any, but that is very bad practice).
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