How to Assign a Custom Domain to Office 365 User Accounts

Sathish Nadarajan
Solution Architect
July 12, 2018
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Usually, When we get our tenant, either it is a free trial or a paid one, we will get the credentials as But, when we go for a corporate, this IDs wont work. In that case, we want to have a custom domain name right.

E.g., My tenant user ID is But, I want the username to be and the mail ID should also be instead of a lengthy one. To achieve that, we need to follow the below steps.

1. Purchase a Domain name from GoDaddy or any other provider. Even, we can purchase it on the office admin portal itself.


2. Now, we assume that, we have a valid domain purchased.

3. Go to the office admin portal using the tenant admin.


4. Go to Setup – > Domains on the left navigation pane.


5. Here, we will see all the existing domains.


6. Either we can buy a domain from here itself, or we have our own domain. In my case, I have bought a domain from GoDaddy and so, I am going to “Add Domain” option.

7. Click on Add Domain option


8. Enter the domain name.


9. Enter the domain name.


10. Once, we add, we need to Verify the domain. We will see the below screen once we add the domain.


11. Now, we need to go to our GoDaddy or NameCheap, from whoever, we bought the domain.

12. Add the TXT entry on the DNS of our domain.


13. Now, come back to our Office 365 portal and click on Verify.

14. It will take few mins to be verified. Hence, requested to wait for few mins.

15. Then, follow the instructions. It will automatically lead to the completion.

16. Once, the domain is added, we will be seeing like below.


17. Then, the users mail IDs will be changed to instead of

18. Even, when we try to add new users, it will show both the domain names and we can choose the one appropriately.


Happy Coding,

Sathish Nadarajan.

Category : Office 365, SharePoint

Author Info

Sathish Nadarajan
Solution Architect
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Sathish is a Microsoft MVP for SharePoint (Office Servers and Services) having 13+ years of experience in Microsoft Technologies. He holds a Masters Degree in Computer Aided Design and Business more

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