Article ID: 2637915 - View products that this article applies to.
Consider the following scenario:
550 5.7.1 Transport rules loop count exceeded
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.
To resolve this issue, install the following update rollup:
(https://support.microsoft.com/kb/2706690/ )Description of Update Rollup 4 for Exchange Server 2010 Service Pack 2
To work around this issue, create an external contact for User A in Organization 2, and then add the contact to the distribution group.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the multi-tenant Exchange deployment, go to the following Microsoft website:
Multi-tenant supportFor more information about how to create a tenant organization, go to the following Microsoft website:
Create a tenant organization
Article ID: 2637915 - Last Review: August 14, 2012 - Revision: 1.0