Update email addresses after you add a domain

After you add a domain to Office 365 operated by 21Vianet, you can update email addresses to use the custom domain name. You might have done this for some or all of your users in the domains setup wizard.

If you decided (in the wizard) to update email addresses later or you want to use a different domain name for a user's Office 365 email address, here’s how you change it.

  1. Sign in to Office 365 with your work or school account.

  2. Click Admin.

    The Office 365 home page with the Admin app highlighted

    Can't find the app you're looking for? From the app launcher, select All apps to see an alphabetical list of the Office 365 apps available to you. From there, you can search for a specific app.

  3. Do one of the following:

    • For Office 365 Small Business, choose a link under Users and groups.

    • For all other Office 365 plans, on the left navigation bar, choose Users > Active Users.

  4. Locate the user whose email address you want to update, choose the user, and then click Edit Edit .

  5. On the Details tab, under User name, click the drop-down box for the email address domain and choose a domain.

  6. Click Save.

Important:  If the user that you are trying to edit is synchronized with your Active Directory service, you’ll see an error message. You can’t edit the user using these steps; instead, edit the user using your local Active Directory management tools.

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