Change your email address to use your custom domain

Your initial email address in Microsoft 365 includes .onmicrosoft.com, like [e-mail]. You can change it to a friendlier address like [e-mail]. You'll need your own domain name, like fourthcoffee.com first. 

When you change your domain's email to come to Microsoft 365, by updating your domain's MX record during setup, ALL email sent to that domain will start coming to Microsoft 365. Make sure you've added users and created mailboxes in Microsoft 365 for everyone who has email on your domain BEFORE you change the MX record. Don't want to move email for everyone on your domain to Microsoft 365? You can take steps to pilot Microsoft 365 with just a few email addresses instead.

Change your email address to use your custom domain using the Microsoft 365 admin center

You must have a global admin account to perform these steps.

1. Go to the admin center at https://admin.microsoft.com.

2. Go to the Setup > Domains page.

3. On the Domains page, select Add domain.

4. Follow the steps to confirm that you own your domain and to change your email address.

You'll be guided to get everything set up correctly with your domain in Microsoft 365.