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

  • Applies to:
  • Operations Automation

Symptoms

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.

Cause

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

Resolution

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.

AdditionalInformation

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

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