Your company might need multiple domain names for different purposes. For example, you might want to add a different spelling of your company name because customers are already using it and their communications have failed to reach you.
Follow these steps to add a new domain:
In the Microsoft 365 admin center, choose Setup.
Under Get your custom domain set up, select View.
Choose Manage > Add domain.
Enter the new domain name that you want to add, and then select Next.
Sign in to your domain registrar, in this case GoDaddy, and then select Next.
If prompted, sign in to your registrar, and then choose Authorize.
Choose Add the DNS records for me, and then select Next.
Choose the services for your new domain and clear the check boxes for any services that will be handled by a different domain. For example, if you just want to use the new domain for email, choose Exchange, and clear the check boxes for Skype for Business and Mobile Device Management for Office 365.
Select Next > Authorize > Next > Finish. Your new domain has been added.
To receive email at your new domain, you'll need to add a new email alias for each user:
Select Users > Active users, and then select the user who will be assigned the new alias.
Choose Manage email aliases > Add an alias.
Enter the username, and then choose the new domain from the drop-down list.
Select Save changes, and then close the window.
Repeat these steps for each user who should receive email at the new domain.
Your company might have multiple domain names that it uses for different purposes; for example, contoso.com and contoso.net. In our case, we want to add a different spelling of our company name because customers have already been using it and have failed to reach us.
Let's see how to add another domain name.
From the Microsoft 365 admin center, choose Setup. Then, under Get your custom domain set up, select View.
Choose Manage, then Add domain.
Enter the new domain you want to add. Select Next.
Because our domain is registered at GoDaddy, we can sign in from here. Choose Sign in at GoDaddy, and select Next.
If prompted, sign in to your registrar, then choose Authorize.
Choose Add the DNS records for me, then Next.
We'll choose Exchange and deselect Skype and Mobile, since we already have a domain for those services and we just want to use this domain for email. Select Next, Authorize, Next, then Finish.
Your new domain has been added.
In order to receive email with this new domain, you'll need to add it as a new email alias for each user. Select Users, Active users, then the user you want to add the email alias for.
Choose Manage email aliases, then Add an alias.
Enter the username, use the drop-down to choose your new domain, select Save changes, then close the windows. Repeat these steps for everyone who should receive email with the new domain.
Emails to the new alias will now be redirected to the user's primary email account.