• I am having a problem wherebyInternal e-mails will stop flowing suddenly while mails from external domains will hit user mailboxes.

    Current resolution has been to reboot one of the Domain Controllers and then e-mails will start hitting mailboxes.

    Environment has Exchange Server 2013 and the AD servers are on windows 2008

    any help/ ideas out there?

    Friday, April 7, 2017 1:50 PM

All replies

  • That's less than ideal.

    Have you checked your event logs for the Exchange server/s? Does internal mail flow stop for all users? 

    I'd be looking into the event logs on your DC as well. Is your DNS in a healthy state?

    Friday, April 7, 2017 3:25 PM
  • Hii <g class="gr_ gr_7 gr-alert gr_spell gr_run_anim gr_inline_cards ContextualSpelling ins-del multiReplace" data-gr-id="7" id="7">Tixy</g>,

    All exchange users are impacted or just a single user...?

    if all users are impacted then check the recent changed in your environment (hotfix)

    Friday, April 7, 2017 3:31 PM
  • all exchange users are impacted
    Friday, April 7, 2017 4:31 PM
  • Hi

    Yes internal mail flow stops for all users. DNS events does not show errors. How do I do a DNS health check?

    Friday, April 7, 2017 4:35 PM
  • Hi,

    Are there any event warnings or errors such as Event ID 15004, 15005 15006 etc?

    If yes, please post out in detail.

    Any NDR messages bounce back? Or the message stuck in Outbox or transport queue?

    If in queue, please run get-queue | fl check the last error message.

    If in Outbox, please check the submission log in the following path:


    Meanwhile, please check the server components status with the command: get-servercomponentstate when the mail flow break.

    Hope it helps.


    Jason Chao

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    Monday, April 10, 2017 7:37 AM