Microsoft IIS SMTP Server error-> 550 error

I am trying to setup a SMTP server (email receipts for our commerce site), and I receive a 550 error. Below is what I grabbed from telnet:

rcpt to: <ryanr@nni.com>
550 5.7.1 Unable to relay for ryanr@nni.com

When I authenticate, it sends fine. However, the components for the site (SendSMTP) cannot authenticate. In terms of security, I restricted the server to only accept emails from its own ip, perform r-dns on all attempts to use the server, and blocked off port 25 at the router (incoming connections). Hopefully that will keep the spammers at bay.

Unfortunately, I cannot seem to get the server to send its test message, much less any emails. The Commerce App is running on high-levels accounts, so there shouldn't be any problems. Any ideas what is going on here? Perhaps I forgot to configure something.

Oh yeah, this server is running on IIS 6.0, on Windows 2003 EE.
rossryanAsked:
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JasonBighamCommented:
"I restricted the server to only accept emails from its own ip"

Then you will only be able to send a test email FROM that server(no clients). I imagine you will at least be adding two other IP's. One from your ISP, and one from whatever is sending mail to this box off your LAN. Where is your mail going TO? Are you using the SmartHost option or DNS(mx records needed)?

One method(i use this with a smarthost on the mail server and the iis gateway):
Clients ---> mail server --> iis gateway --> ISP
               
The former has to be allowed to relay by the latter.

I.E.

iis gateway allows the IP addrsss from the mail server to relay.
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rossryanAuthor Commented:
Fixed it. Forgot to add the localhost to the authorized relays.

Thanks,
Ryan
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