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Last Error: A local loop was detected. Exchange 2010 - Linux Postfix

Posted on 2013-05-19
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Last Modified: 2013-05-25
Hello,


Here is the scoop . . . I can send messages to accounts that reside on my Exchange servers and to external accounts I am not hosting.  If I try to send messages to accounts that reside on the Linux/Postfix server, the messages sit in the Exchange message queue.  An example of one of the messages "stuck" is:


Identity: Server0\Submission\660
Subject: TEST @ 1937
Internet Message ID: <E3336DF928658B45AD4B60C756612AD53D5452@GEMWIN0000>
From Address: exchange@domain.com
Status: Retry
Size (KB): 5
Message Source Name: SMTP:Default Server0
Source IP: 192.168.217.10
SCL: 0
Date Received: 5/19/2013 9:11:09 PM
Expiration Time: 5/21/2013 9:11:09 PM
Last Error: A local loop was detected.
Queue ID: Server0\Submission
Recipients:  postfix@domain.com



Here are my send connector settings:


Address Space - SMTP, *, 1

Network - Use domain name system (DNS) "MX" records to route mail automatically & Use the External DNS Lookup settings on the transport server

Source Servers - The private IP addresses of my two Exchange servers.



Any ideas?


Thank you for your time,


Don
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Question by:GEMCC
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LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39180245
You need to adjust your Exchange configuration to route email correctly.
This is easily done by following this Technet article:

http://semb.ee/sharesmtp2010

Simon.
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Author Comment

by:GEMCC
ID: 39180711
I did that before entering this question.

Thank you.
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LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 39180731
If you have already tried something then you should post that, because otherwise how is anyone supposed to know?

If you have done it then either your Send Connector isn't configured correctly then going by what you have posted above or you haven't posted complete information.

You should have two Send Connectors, a generic one and a specific one for the domain that you are sharing the SMTP Address Space with.

Simon.
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Accepted Solution

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GEMCC earned 0 total points
ID: 39182970
Hello,

Sorry, forgot to tell you that.  Anyway, fixed per  http://social.technet.microsoft.com/Forums/en-US/exchangesvrsecuremessaging/thread/8eb458ae-42e9-4aba-a181-4ffaf627c3e8


Thanks for your input


Don
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Author Closing Comment

by:GEMCC
ID: 39196312
It works!
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