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Article ID: 1497, created on Oct 6, 2008, last review on May 10, 2014

  • Applies to:
  • Operations Automation


Mails are not get delivered to distribution lists containing external recepients. You can see that messages are stuck in 'Messages Awaiting Directory Lookup' queue on the SMTP Front-end.


If you disable the Exchange Information Store on front-end servers, messages remain in the 'Messages Awaiting Directory Lookup' queue.


It is recommended that you keep the Exchange Information Store service running on Front-end servers to process messages successfully.

Note, if the Front-end server does not serve as a Transport Gateway, then the store is not required.


For more information refer to the following article: http://msexchangeteam.com/archive/2006/06/23/428114.aspx

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