After you add and verify your own domain successfully in Office 365, you can change your primary email address from the default onmicrosoft.com to the domain you just verified. Steps below:
- Log in Office 365 Portal and go to the Admin page.
- Click Users
- Select the user and click Edit.
- Click Details
- Click the dropdown list of domains beside user name and choose your own domain.
- Click Save.
Why is there still the onmicrosoft.com domain after I added and verified my own domain in Office 365? The onmicrosoft.com will not and cannot be deleted from Office 365. This is the primary domain that Microsoft uses in its multitenant environment, also known as Office 365. Just accept that it’s there and don’t worry about it.
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Office 365 MVP