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  • DNS query failed in queue

    Hi,
    We are having trouble to send to this one particular external domain.
    All other domain is OK.
    We received message - Delivery is delayed to these recipients or groups

    the Use the external DNS Lookup is checked


  • #2
    Have you carried out a DNS query from the server for the DNS records? To confirm they work correctly?
    Have you seen this article on DNS queries?
    https://support.microsoft.com/en-us/kb/968372

    Simon.
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    Simon Butler
    Exchange MVP

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    • #3
      Below link resolved the problem.
      Please refer to the following article :

      451 4.4.0 DNS query failed Exchange Server error in message queue

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