Change your default domain for email in Office 365

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

Tip: 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.

Important: We’re rolling out changes to the Office 365 admin center every month to a selection of users. Check out Which version of the admin center do you see? to see what version of the admin center you have.

Which version of the admin center do you see?

If you see this, follow the steps under Change your default name for email using Office 365 setup.

Illustration of the Office 365 Admin Center. Find out more about the Office 365 admin center

If you see this, follow the steps under Change your default name for email using Office 365 setup in the Admin Center Preview.

Illustration of the Office 365 Preview Admin Center. Find out more about the Office 365 Preview admin center

Tip: We're still working on the admin center preview. You can switch back to the classic admin center if a setting or task you need is not yet available in the preview.

Change your default name for email using Office 365 setup

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

  2. Go to the 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

Change your default name for email using Office 365 setup in the Admin Center Preview

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

  2. Go to the Domains page.

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

  4. Click Set as default.

    Select a domain, and choose Set as default

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