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Messages sit in outbox

    Question

  • Our environment is 2 sites, primary site has 2 MB servers and 3 CAS servers. External email is routed to a smarthost which is a cluster of SonicWALL virtual appliances. Our 2nd site is our DR site is made up of 1 MB server and 2 CAS servers. The CAS servers from both sites are members of the same cluster. All 3 MB servers are members of the same DAG. The DR site database automatic database activation is blocked. I am testing mail flow in the DR site and have run into a problem when a DB is activated in the DR site the mailboxes can receive email but when sending email it just sits in the out box.  When I check the MSG Trk logs I see multiple entries like the following:

    2018-01-12T19:00:37.780Z,fe80::4971:d6:b6ab:3ba5%14,DRServer,,,"MDB:ed7703a5-5726-45f5-ab9e-b9249891a6e3, Mailbox:38a4b8ab-36a6-41eb-9a41-1d46be3b5ab2, Event:6251540, MessageClass:IPM.Note, CreationTime:2018-01-12T17:27:07.498Z, ClientType:MOMT",,STOREDRIVER,SUBMITDEFER,,<85ae194b06fd486b81fce60ac2d4008d@DRServer.Local.com>,909667f4-8ee8-4b16-2b81-08d559eec492,Test.User1@Domain.com,,,1,,,,Test.User2@Domain.com,,2018-01-12T17:27:07.498Z;LSRV=DRServer.Local.com:TOTAL-SUB=5610.281|UTH=0.002|SA=5610.260|MTSSDA=0.003|MTSSDC=0.004|MTSSDPL=0.004|MTSSD=0.019|MTSS=0.019,Originating,,,,"S:ItemEntryId=00-00-00-00-7C-66-AF-2E-16-2F-18-4F-B6-0F-CA-12-BB-D6-4F-FC-07-00-72-2A-20-A0-30-80-FB-42-A0-AC-D6-DF-8E-63-C2-D9-00-00-00-00-01-0B-00-00-72-2A-20-A0-30-80-FB-42-A0-AC-D6-DF-8E-63-C2-D9-00-00-CB-DE-9F-C2-00-00;S:DiagnosticInfo=Error: RetrySmtp, Diagnostic Information: Stage:CommitMailItem, SmtpResponse:451 4.4.0 DNS query failed. The error was: DNS query failed with error ErrorRetry"

    Monday, January 15, 2018 6:18 AM

All replies

  • Are there firewalls between the sites?  Are ALL ports open between the servers?

    Can all servers resolve all hostnames and domains they need in DNS?

    Does this help?

    https://support.microsoft.com/en-us/help/3038746/451-4-4-0-dns-query-failed-exchange-server-error-in-message-queue


    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!


    Monday, January 15, 2018 6:54 PM
    Moderator
  • Hi,

    Thanks for contacting our forum.

    Firstly, we need to check if the Mailbox transport submission service is running and make sure the member server'd DNS and default gateway point to DC, then check the results.

    Hope it helps.


    Regards,

    Jason Chao


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

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    Tuesday, January 16, 2018 6:39 AM
    Moderator
  • All Exchange services are running and DNS and gateway are correct. Sorry that I didn't post that in my original submission. 
    Tuesday, January 16, 2018 1:16 PM
  • Thanks for your response.

    What about this issue in OWA? Does the messages still in OWA? It seems the messages cannot be submitted.

    We can enable the protocol logging on the intra-organization Send connector in the Transport service and in the Mailbox Transport Submission service on the server named Mailbox01:

    Set-TransportService Mailbox01 -IntraOrgConnectorProtocolLoggingLevel Verbose

    Then send some messages for testing

    Log path: %ExchangeInstallPath%TransportRoles\Logs\Mailbox\ProtocolLog\SmtpSend\Submission

    Please check if any error messages and post out if exist.

    Thanks for your effort.


    Regards,

    Jason Chao


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

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Wednesday, January 17, 2018 2:41 AM
    Moderator
  • Same issue in OWA. I ran the command and sent a few emails then checked the location for logs but there were none. I also noticed that the server in the DR site is also a member of the Domain Admins group. Not sure how that happened. The are a few error in the event logs but not sure they are related. There is a 16025 error but there is only one NIC when I run the Get-NetworkConnectionInfo command the info returned does not match what is in the 16025 event.
    • Edited by Email Tech Friday, January 19, 2018 8:06 AM
    Friday, January 19, 2018 7:52 AM
  • Thanks for your response.

    Please restart the MS exchange submission service and transport service.

    We can also check the server components states with command: get-servercomponentstate and check if any component is not in active.

    Then restart the Exchange server.

    Hope it helps.


    Best Regards,
    Jason Chao


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


    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Wednesday, January 24, 2018 9:47 AM
    Moderator
  • Hi,

    I am currently standing by for further update from you and would like to know how things are going. If you have any questions, please don't hesitate to let me know. And if the replies has helped you, please help to mark as answer and it could be helpful for others.

    Thanks for your time and have a nice day!


    Best Regards,
    Jason Chao


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


    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Wednesday, January 31, 2018 9:48 AM
    Moderator