Exchange 2003, SMTP Relay Permissions

I need to allow Microsoft Dynamics NAV to relay through our exchange server to send its purchase orders. I've configured the exchange servers SMTP Virtual Server to allow relaying from the NAV servers IP.

However it doesnt allow relaying to external addresses, if I try to send a purchase order to an internal address it works fine, if I try to send it to an external address I get "The server rejected one or more recipient addresses. The server response was: 550 5.7.1 Unable to relay for external address"

I've enabled diagnostic logging on the exhange server for SMTP events to go with the above message I get the following event

This is an SMTP protocol log for virtual server ID 1, connection #21. The client at "192.168.200.2" sent a "rcpt" command, and the SMTP server responded with "550 5.7.1 Unable to relay for ExternalAddress". The full command sent was "rcpt TO: <ExternalAddress>".  This will probably cause the connection to fail.


Any ideas as to what is going on here.
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jmcmillenAsked:
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debuggerauCommented:
Are you able to get a screen shot of your SMTP Virtual Server's settings?

I suspect you have the IP address in, however only for authenticated users, which I doubt they would be..

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jmcmillenAuthor Commented:
Yep that was it exactly, hate it when I overlook something simple like that. Ahh well, thanks for that.
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