Office Support / Office 365 Admin / Domains

Change your default domain for email in Office 365

After you set up a custom domain in Office 365 (like, for example), you can change the default domain used for new email addresses when you add users in Office 365.

If you already have a custom domain and want to change your default domain to a different one, just go to Domains > Add domain to follow the same step-by-step wizard in Office 365 to add another domain. Then change your default domain as shown below.

You must have at least one custom domain that you've added to Office 365 before you can choose a default domain.

To choose a new default domain for email addresses:

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

  2. Go to the Manage domains page.

  3. On the Manage domains page, choose the domain you want to set as the default for new email addresses.

  4. On the right, click Set as default.

    On the Manage domains page, choose Set as default

Applies To: Office 365 Admin, Office 365 Small Business Admin

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