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NonExistentDomain; nonexistent domain -> DnsDomainDoesNotExist: InfoDomainNonexistent RRS feed

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    Hi,

    We have configured two Exchange 2016 servers in DAG mode. The send connector is configured with SmartHost.

    The emails are delivering and receiving without any issue with in orginization. However, if we send an email from any external email ( like from gmail) then we are getting the following error. Can anyone guide us on this case. 

    Server at  returned '400 4.4.7 Message delayed'
    10/10/2017 7:51:08 PM - Exc-he-db01 returned '451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain -> DnsDomainDoesNotExist: InfoDomainNonexistent'

    Original message headers:

     
    • Edited by Asif-Janjua Wednesday, October 11, 2017 6:22 AM
    Wednesday, October 11, 2017 6:20 AM

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    Hi,

    Thanks for contacting our forum.

    Given the error message, it seems that our domain DNS records cannot be lookup correctly. You can use NSlookup to check. Meanwhile, you can use telnet command to test too.

    We can also use the MXToolbox: https://mxtoolbox.com/ to test our domain, if we have a DNS records configured correctly.

    If any test results, please post out. Or you can post out your domain name, i can help to test.

    Hope it helps.

    Regards,

    Jason Chao

    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Edited by Jason.Chao Thursday, October 12, 2017 3:37 AM
    • Proposed as answer by Jason.Chao Saturday, October 14, 2017 2:22 AM
    Thursday, October 12, 2017 3:36 AM
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    Hi Jason, 

    Thanks for your reply. I have managed to resolve the issue. This kind of issue appears if MX record is not properly pointing to smart host ( if smart host has been used by Exchange administrator).

    • Proposed as answer by Jason.Chao Wednesday, November 1, 2017 5:07 AM
    Friday, October 27, 2017 2:26 PM
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    Thanks for your response.

    Glad to hear that the issue has been resolved, please help to mark the reply as answer if it helps.

    Thanks and it'll be helpful for others.

    Regards,

    Jason Chao

    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    • Proposed as answer by Jason.Chao Thursday, November 9, 2017 2:35 AM
    Wednesday, November 1, 2017 5:09 AM