Create DNS records for Office 365 using Windows-based DNS

Check the Domains FAQ if you don't find what you're looking for.

If you host your own DNS records using Windows-based DNS, follow the steps in this article to set up your records for email, Skype for Business Online, and so on.

To get started, you need to find your DNS records in Windows-based DNS so you can update them. Also, if you're planning to synchronize your on-premises Active Directory with Office 365, see Non-routable email address used as a UPN in your on-prem Active Directory.

ouble with mail flow or other issues after adding DNS records, see Troubleshoot issues after changing your domain name or DNS records.

Find your DNS records in Windows-based DNS

Go to the page that has the DNS records for your domain. If you're working in Windows Server 2008, go to Start > Run. If you're working in Windows Server 2012, press the Windows key and r. Type dnsmgmnt.msc, and then choose OK. In DNS Manager, expand <DNS server name> > Forward Lookup Zones. Choose your domain. You're now ready to create the DNS records.

Add MX record

Add an MX record so email for your domain will come to Office 365.

  • The MX record you'll add includes a value (the Points to address value) that looks something like this: <MX token>.mail.protection.outlook.com, where <MX token> is a value like MSxxxxxxx.
  • From the MX row in the Exchange Online section of the Add DNS records page in Office 365, copy the value listed under Points to address. You'll use this value in the record you're creating in this task.
  • On the DNS Manager page for the domain, go to Action > Mail Exchanger (MX). To find this page for the domain, see Find your DNS records in Windows-based DNS.
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
    • Host Name:
    • @Address: Paste the Points to address value that you just copied from Office 365 here.
    • Pref:
  • Choose Save Changes.
  • Remove any obsolete MX records. If you have any old MX records for this domain that route email somewhere else, select the check box next to each old record, and then choose Delete. Choose OK.

Add CNAME records

Add the CNAME records that are required for Office 365. If additional CNAME records are listed in Office 365, add those following the same general steps shown here.

Important

If you have Mobile Device Management (MDM) for Office 365, then you must create two additional CNAME records. Follow the procedure that you used for the other four CNAME records, but supply the values from the following table. (If you do not have MDM, you can skip this step.)

  • On the DNS Manager page for the domain, go to Action > CNAME (CNAME).
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
    • Host Name: autodiscover
    • Type:
    • CNAMEAddress: autodiscover.outlook.com
  • Choose OK.

Add the SIP CNAME record.

  • On the DNS Manager page for the domain, go to Action > CNAME (CNAME).
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
    • Host Name: sip
    • Type: CNAME
    • Address: sip
    • dir.online.lync.com
  • Choose OK.

Add the Skype for Business Online Autodiscover CNAME record.

  • On the DNS Manager page for the domain, go to Action > CNAME (CNAME). In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
    • Host Name: lyncdiscover
    • Type: CNAME
    • Address: webdir.online.lync.com
  • Choose OK.

Add two CNAME records for Mobile Device Management (MDM) for Office 365

Important

If you have Mobile Device Management (MDM) for Office 365, then you must create two additional CNAME records. Follow the procedure that you used for the other four CNAME records, but supply the values from the following table. >(If you do not have MDM, you can skip this step.)

Add the MDM Enterpriseregistration CNAME record.

  • On the DNS Manager page for the domain, go to Action > CNAME (CNAME).
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
  • Host Name: enterpriseregistration
  • Type: CNAME
  • Address: enterpriseregistration.windows.net
  • Choose OK.

Add the MDM Enterpriseenrollment CNAME record.

  • On the DNS Manager page for the domain, go to Action > CNAME (CNAME).
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
    • Host Name: enterpriseenrollment
    • Type: CNAME
    • Address: enterpriseenrollment-s.manage.microsoft.com
  • Choose OK.

Add a TXT record for SPF to help prevent email spam

Important

You cannot have more than one TXT record for SPF for a domain. If your domain has more than one SPF record, you'll get email errors, as well as delivery and spam classification issues. If you already have an SPF record for your domain, don't create a new one for Office 365. Instead, add the required Office 365 values to the current record so that you have a single SPF record that includes both sets of values.

Add the SPF TXT record for your domain to help prevent email spam.

  • You might already have other strings in the TXT value for this record (such as strings for marketing email), which is fine. Leave those strings in place and add this one, placing double-quotes around each string to separate them.
  • On the DNS Manager page for your domain, go to Action > Text (TXT).
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values.

Important

In some versions of Windows DNS Manager, the domain may have been set up so that when you create a txt record, the home name defaults to the parent domain. In this situation, when adding a TXT record, set the host name to blank (no value) instead of setting it to @ or the domain name.

  • Host type: @

  • Record Type: TXT

  • Address: v=spf1 include:spf.protection.outlook.com -all

  • Choose OK.

Add SRV records

Add the two SRV records that are required for Office 365.

Add the SIP SRV record for Skype for Business Online web conferencing.

  • On the DNS Manager page for your domain, go to Action > Other New Records.
  • In the Resource Record Type window, choose Service Location (SRV), and then click Create Record.
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
    • Service: _sipProtocol: _tls
    • Priority: 100
    • Weight: 1
    • Port: 443Target (Hostname): sipdir.online.lync.com
  • Choose OK.

Add the SIP SRV record for Skype for Business Online federation.

  • On the DNS Manager page for your domain, go to Action > Other New Records.
  • In the Resource Record Type window, choose Service Location (SRV), and then click Create Record.
  • In the New Resource Record dialog box, make sure that the fields are set to precisely the following values:
    • Service: _sipfederationtls
    • Protocol: _tcpPriority: 100
    • Weight: 1
    • Port: 5061
    • Target (Hostname): sipfed.online.lync.com
  • Choose OK.

Add a record to verify that you own the domain, if you haven't already

Before you add the DNS records to set up your Office 365 services, Office 365 has to confirm that you own the domain you're adding. To do this, you add a record, following the steps below.

Note

This record is used only to verify that you own your domain; it doesn't affect anything else.

Gather information from Office 365.
Sign in to Office 365 with your work or school account. Choose Setup > Domains.

  • On the Manage domains page, in the Action column for the domain that you are verifying, choose Start setup.
  • On the Add a domain to Office 365 page, choose Start step 1.
  • On the Confirm that you own your domain page, in the See instructions for performing this step with drop-down list, choose General instructions.
  • From the table, copy the Destination or Points to Address value. You'll need it for the next step. We recommend copying and pasting this value, so that all of the spacing stays correct.

Add a TXT record.

  • On the DNS Manager page for your domain, go to Action > Text (TXT).
  • In the New Resource Record dialog box, choose Edit.
  • In the Custom Host Names area of the New Resource Record dialog box, make sure that the fields are set to precisely the following values.

Important

In some versions of Windows DNS Manager, the domain may have been set up so that when you create a txt record, the home name defaults to the parent domain. In this situation, when adding a TXT record, set the host name to blank (no value) instead of setting it to @ or the domain name.

  • Host Name: @
  • Type: TXT
  • Address: Paste the Destination or Points to Address value that you just copied from Office 365 here.
  • Choose OK, and then choose Done.

Verify your domain in Office 365.

Important

Wait about 15 minutes before you do this, so the record you just created can update across the Internet.

  • Go back to Office 365 and follow the steps below to request a verification check. The check looks for the TXT record you added in the previous step. When it finds the correct TXT record, the domain is verified.
  • Choose Setup > Domains.
  • On the Manage domains page, in the Action column for the domain you are verifying, choose Start setup.
  • On the Confirm that you own your domain page, choose done, verify now, and then in the confirmation dialog box, choose Finish.

Note

Typically it takes about 15 minutes for DNS changes to take effect. However, it can occasionally take longer for a change you've made to update across the Internet's DNS system. If you're having trouble with mail flow or other issues after adding DNS records, see Troubleshoot issues after changing your domain name or DNS records.

Non-routable email address used as a UPN in your on-prem Active Directory

If you're planning to synchronize your on-premises Active Directory with Office 365, you'll want to make sure that the Active Directory user principal name (UPN) suffix is a valid domain suffix, and not an unsupported domain suffix such as @contoso.local. If you need to change your UPN suffix, see How to prepare a non-routable domain for directory synchronization.

Note

Typically it takes about 15 minutes for DNS changes to take effect. However, it can occasionally take longer for a change you've made to update across the Internet's DNS system. If you're having trouble with mail flow or other issues after adding DNS records, see Troubleshoot issues after changing your domain name or DNS records.