How To Change Domain Name In Email. Choose a new domain name and assign it to your website. Make sure to have the current primary domain the new primary domain and the last four of your password ready.
Under Your subscription select Manage. Select the Domains option located at the bottom of the Admin Console home page. You will see a notification that reads something like this.
Change your email address to use your custom domain using the Microsoft 365 admin center Go to the Setup Domains page.
Click the Change domain link and choose one of the options. You will see a notification that reads something like this. Follow the steps to confirm that you own your domain and to change your email address. Add your new domain and set up email.