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I understand that you have set up an Office 365 tenant, and have verified a custom domain. Given this situation, please continue to create the DNS records for Office 365 services. I have provided the detailed information as below:
For Office 365 Small Businesses, there are two options:
Option 1: Redirect the Name Server records to Office 365. In this situation, we need to change the Name Server records to ns1.bdm.microsoftonline.com and ns2.bdm.microsoftonline.com. After that, Office 365 manages and hosts all DNS records for your domain. DNS records such as CNAME record and A record for Microsoft Office 365 services will be automatically created.
Please note: When you change your domain’s NS records to point to Office 365, all of the services that are currently associated with your domain—for example email, websites, blogs, and shopping carts—are affected.
To change Name Server records, you can refer to http://onlinehelp.microsoft.com/en-us/office365-smallbusinesses/gg549203.aspx.
Option 2: Add your domain to Office 365 without redirecting your name server records to Office 365. In this situation, Office 365 doesn’t host the DNS records. You will need to create the required DNS records for Office 365 services at your domain registrar. For example, if you would like to use the custom domain for SharePoint Online, you will need to create an A record and a CNAME record for WWW at your domain registrar. For detailed information, you can refer to the following article:
Add your domain to Office 365 without redirecting your name server records to Office 365
For Office 365 Enterprises, Office 365 doesn’t host the DNS records. You will need to create the DNS records at your domain registrar. The DNS records information can be found by performing the following steps:
a. Log in Office 365, click Admin. Click Domains on the left side.
b. Select your custom domain, click View DNS Settings. The required DNS records such as MX record are shown in the opening page.
For more information about Office 365, you can go to the following sites:
For Office 365 Small Businesses:
For Office 365 Enterprises:
How are the things going? Do you have any other questions about this issue?