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

Posted on 2011-09-27
Last Modified: 2012-05-12
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:

Has anyone seen this before?
Question by:ChocolateRain
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Author Comment

ID: 36713100
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:


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

AGCV10k.domain.lcl #550 5.7.1 Unable to relay ##

Original message headers:

Received: from ( by agcv10k.domain.lcl (
 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: <>
To: Undisclosed recipients:;
Date: Tue, 27 Sep 2011 13:48:01 -0700


Accepted Solution

Ganesh G earned 500 total points
ID: 36713302
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.


Author Comment

ID: 36713484
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 + is what ended up working.

Expert Comment

by:Ganesh G
ID: 36713502
Sounds good :)

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