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Exchange 2010 Mail Flow problem

    Question

  • Dear All as there is no Exchange 2010, so I select Exchange 2013.

    Exchange 2010 SP3, No Antivirus

    We have Two AD Sites & One DAG "TIGER" 

    In HeadOffice: 2 Mailboxes & 2 HUB/CAS (10 Databases)

    In DR: 1 Mailbox+Hub/CAS (All Roles in Single)

    Now in test scenario we move only One DB users from HeadOffice to DR, while others are at HeadOffice.

    In this situation my users successfully connected from DR site, while testing email flow

    Users from DR send me email and I received in my Inbox

    When I from HeadOffice send email to DR users they didnt receive any email.

    I found all mails in DR Server Queues "Site=Active Directory Site" Error" 451 4.4.0 dns query failed smtpsend.dns.nonexistentdomain"

    Can someone please help me to troubleshoot/resolve this issue.

    Regards

    Safiullah Khan

    Thursday, December 17, 2015 6:08 PM

Answers

  • I my self, resolve this Issue. It was related to Exchange it self. Now services working fine. Thanks :)

    • Marked as answer by Safiullah Khan Friday, December 18, 2015 11:25 AM
    Friday, December 18, 2015 11:25 AM

All replies

  • Hi Khan,

    Thank you for your question.

    This issue occur by the network issue.

    Please check the IP of NIC on Exchange server in DR site, if there is external DNS which was configured on “Alternate DNS server”, then remove it and restart “Microsoft Exchange Transport Service” on all Exchange server to check if the issue persist.

    If not, please check if there are any errors in application log and post them for our troubleshooting.

    Best Regard,

    Jim Xu

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact tnmff@microsoft.com.

    Jim Xu
    TechNet Community Support

    Friday, December 18, 2015 7:54 AM
    Moderator
  • I my self, resolve this Issue. It was related to Exchange it self. Now services working fine. Thanks :)

    • Marked as answer by Safiullah Khan Friday, December 18, 2015 11:25 AM
    Friday, December 18, 2015 11:25 AM