You receive an NDR when you send an e-mail using OWA Premium and the ANR cache if the Exchange organization name has more than one space

Article translations Article translations
Article ID: 960178 - View products that this article applies to.
Expand all | Collapse all


Consider the following scenario:
  • In a Microsoft Exchange Server 2007 environment, you send an e-mail by using Microsoft Outlook Web Access (OWA) Premium.
  • The Exchange Organization name has multiple words in the name.
  • There is more than one space in between these words.
  • You use the Ambiguous Name Resolution (ANR) cache to pick up the recipient.
In this scenario, you may receive the following Non Delivery Report (NDR):
Delivery has failed to these recipients or distribution lists:
/o=<Organization name>/ou=<Administrative group name>/cn=Recipients/cn=<user name>
The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##

This problem does not occur when you use Microsoft Outlook Web Access Light or Microsoft Outlook.

Note OWA Premium is the default access of OWA.


To resolve this problem, install Update Rollup 8 for Exchange 2007 Service Pack 1. For more information about Update Rollup 8 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:
Description of Update Rollup 8 for Exchange Server 2007 Service Pack 1
For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:
How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007


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


Article ID: 960178 - Last Review: May 19, 2009 - Revision: 1.1
  • Microsoft Exchange Server 2007 Service Pack 1, when used with:
    • Microsoft Exchange Server 2007 Enterprise Edition
    • Microsoft Exchange Server 2007 Standard Edition
kbexpertiseinter kbexpertiseadvanced kbqfe kbsurveynew kbhotfixrollup KB960178

Give Feedback


Contact us for more help

Contact us for more help
Connect with Answer Desk for expert help.
Get more support from