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This article is listed on Office 365 DNS diagnostic tool.

To use your own domain name with Office 365 will need up to 10 DNS records manually configured third-party Domain Registrar Web site.
Misconfiguration of the DNS is one of the top queries received from customers of the Office 365 days a year. May cause problems if DNS record is missing or incorrectly configured in Outlook and mail flow connectivity, Lync sign-in, or external Instant Messaging (IM) provider Federation.

Office 365 DNS Diagnostics detects all the DNS records required for Office 365 services, identifies the known configuration mistakes.

For more information

When you use the Office 365 DNS diagnostic

DNS configuration errors is a primary cause of the problem that is described in this section. Strongly recommended to run Office 365 DNS diagnostic to identify these problems.

Exchange Online problems

  • Mail delivery problems
    • Cannot receive mail on the Internet
    • To receive a non-delivery report (NDR)
  • Outlook client connectivity problems
    • Outlook and Exchange Online connection issues
    • Autodiscover does not work
Lync Online of the problem
  • Lync client sign-in problems
  • IM does not work between the contacts are federated or public IM connectivity partners (PIC)
  • IM from Outlook Web App or presence issues
SharePoint Online the issue
  • Access to the published Web site to use the domain name

How to use the Office 365 DNS diagnostic

Office 365 DNS Diagnostic can be run on Internet-accessible computers. Office 365 DNS diagnostic tool using Nslookup.exe queries and DNS records of Office 365 days a year from the computer's default DNS servers, detects a DNS misconfiguration. However, does not collect data specific to the computer that is running the tool.
  1. Office 365 DNS diagnostic O365 Customer Domain Name page, type the domain name. Office 365 DNS diagnostic tool verify DNS records for the domain.

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    Note domain Office 365 portal ( To verify that have been approved and added. If you have not yet approved the domain will access to the following Microsoft Web site.
    To add a domain to Office 365
  2. Select the scenario that applies in the Exchange Deployment Scenario page. [Cloud Only] or [Co-exist/Hybrid] is optional.

    Scenario if there is more than one domain, select the domain you entered in step 1 applies.
    • If you have moved to Office 365 [Cloud Onlychoose all the mailboxes to the appropriate domain.
    • Select the [Cloud Only] If you don't use the domain to the appropriate Exchange Online mailbox.
    • Select the [Co-exist/Hybrid] If divided into on-premises Exchange Server environment and Exchange Online mailboxes are hosted.


For more information, visit to the following Microsoft Web site.
If you need additional information Office 365 community Please see the Web site.


Article ID: 2776497 - Last Review: October 21, 2014 - Revision: 17.0
Applies to
  • Microsoft Lync Online
  • Microsoft Exchange Online
  • Microsoft SharePoint Online
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