"550 5.7.1" NDR when an email message is sent between tenant organizations in a multi-tenant Exchange Server 2010 environment

Article ID: 2637915 - View products that this article applies to.
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Symptoms

Consider the following scenario:
  • You have two tenant organizations (Organization 1 and Organization 2) in a multi-tenant Microsoft Exchange Server 2010 environment. The environment has Exchange Server 2010 Service Pack 1 (SP1) or a later update rollup installed.
  • Organization 1 has two mail-enabled users (User A and User B).
  • Organization 2 has a distribution group that contains User A.
  • User B in Organization 1 tries to send an email message to the distribution group that is in Organization 2.
In this scenario, User B receives a non-delivery report (NDR) message that contains the following:
550 5.7.1 Transport rules loop count exceeded
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Cause

This issue occurs because the x-ms-exchange-transport-rules-loop value that is used to track message looping is set in the message header incorrectly when the email message is sent between tenant organizations.
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Resolution

To resolve this issue, install the following update rollup:
2706690
(http://support.microsoft.com/kb/2706690/ )
Description of Update Rollup 4 for Exchange Server 2010 Service Pack 2
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Workaround

To work around this issue, create an external contact for User A in Organization 2, and then add the contact to the distribution group.
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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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More information

For more information about the multi-tenant Exchange deployment, go to the following Microsoft website:
Multi-tenant support
(http://technet.microsoft.com/en-us/library/ff923272.aspx)
For more information about how to create a tenant organization, go to the following Microsoft website:
Create a tenant organization
(http://technet.microsoft.com/en-us/library/ff923268.aspx)
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Properties

Article ID: 2637915 - Last Review: August 14, 2012 - Revision: 1.0
Applies to
  • Microsoft Exchange Server 2010 Service Pack 1
  • Microsoft Exchange Server 2010 Service Pack 2, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
Keywords: 
kbqfe kbfix kbsurveynew kbexpertiseinter KB2637915
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