How do I configure Exchange 2007 server to allow relay from an internal smtp IP?

I have an Exchange Server 2007 setup (single server / single farm).  I have some internal server hosts that send email alerts and I need them to be able to anonymously connect to the Exchange 2007 server and relay mail through it.  I can't seem to find anything in the GUI that allows me to do this (at least nothing that works).  I've tried creating new receive connectors and checking the anonymous setting, but that doesn't help either.

I keep getting 'Unable to relay' messages.  I'm assuming there might be a shell-command that I need to issue?  I'd like to lock it down to a certain IP address for the relay 'source machine' if possible.
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qsnowAsked:
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qsnowAuthor Commented:
Awesome. TY.  I was missing the shell command.  Man, exchange 07 is a different BEAST!.

I also finally came across this article:

http://technet.microsoft.com/en-us/library/bb232021.aspx

which helps.
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