Can't relay through Exchange 2010 server based on IP address (only) config

I can relay emails internally (and by relaying I mean using no creds and just authenticating the IP address of the sending server in the Receive Connector of the server) but not externally.  The Receive Connector was setup by using the following instructions:

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

Has anyone seen this before?
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ChocolateRainAsked:
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Ganesh GMessaging ConsultantCommented:
Did u check the for the correct SMTP FQDN on the connectors and also Make sure to configure the Receive Connector as “Externally Secured” on the authentication tab and ensure that you have checked the “Exchange Servers” on the permission tab.

Restart the Microsoft Exchange Transport service.

Regards,
Ganesh
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ChocolateRainAuthor Commented:
More info.  Here is the undeliverable report that the account (really just the email address) that I'm trying to relay out with is getting as an error message.  Even though the address I'm trying to send to is clearly defined it isn't working and showing it as unknown.


AGCV10k.domain.lcl rejected your message to the following e-mail addresses:

"firstname.lastname@gmail.com"@10.10.15.101


AGCV10k.domain.lcl gave this error:
Unable to relay


Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.








Diagnostic information for administrators:

Generating server: AGCV10K.domain.lcl

"firstname.lastname@gmail.com"@10.10.15.101
AGCV10k.domain.lcl #550 5.7.1 Unable to relay ##

Original message headers:

Received: from 10.10.15.101 (10.10.2.123) by agcv10k.domain.lcl (10.10.15.101)
 with Microsoft SMTP Server id 14.1.323.3; Tue, 27 Sep 2011 13:48:01 -0700
Subject: Test Message (No. 38)
MIME-Version: 1.0
Content-Type: text/plain
Message-ID: <0167c526-dd1f-4303-8076-d0e32262f814@AGCV10K.domain.lcl>
From: <s2kemail@domain-global.com>
To: Undisclosed recipients:;
Return-Path: s2kemail@domain-global.com
Date: Tue, 27 Sep 2011 13:48:01 -0700


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ChocolateRainAuthor Commented:
And suddenly it was working.  Setting up the other IP address to work on this receive connector and setting the HELO to match the FQDN of the server + emailaddressnamespace.com is what ended up working.
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Ganesh GMessaging ConsultantCommented:
Sounds good :)
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