Exchange 2010 - Unable to Relay

A system we have sends routine emails out to the company that makes it with support information. That email is sent via our Exchange 2010 server. When I generate this email and send it to my local email account it works fine. When I do the same and send it to any external account it fails with 550 errors related to relaying.
Also, when I try to send an email to any outside address via telnet i get the same thing...See below. Any idea what changes I need to make?

220 cas1.domain.local Microsoft ESMTP MAIL Service ready at Wed, 28 Mar 2012 08:05:28 -0400
helo cas1.domain.local
250 cas1.domain.local Hello []
250 2.1.0 Sender OK
550 5.7.1 Unable to relay

I should note, other than this we are having NO issues in Exchange at all.
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Anonymous relay to external address is disabled by default in Exchange 2007+

Make sure the allowed IP range is internal only (or even a small list of trusted internal IPs)

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akalbfellAuthor Commented:
current settingsThis is our current connector settings. If I understand correctly, we are currently allowing all IP's to send from, but there is a seperate setting to relay to outside which we dont have enabled?

Please see attached screen shot

Under "Organization Configuration" --> "Hub Transport"

Open the send connector and verify that you have "*" for address

This setting tels the send connector wich network to serv...

Let me know (More ideas in the pocket)
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akalbfellAuthor Commented:
I do.

send connector settings
akalbfellAuthor Commented:
akalbfellAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for akalbfell's comment #37776697

for the following reason:

Figured out on own
The link the Author provided, contains information from the official documentation as I've linked.

If the problem had a different underlying issue or the fix was not contained in the first link provided, then the Author comment should state what was different - even if it is just to help  the next person searching for a solution.
akalbfellAuthor Commented:
Sorry didn't notice the article you provided mentioned the same solution all the way at the bottom.
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