FAQ for multiple domains

If you own multiple domains, you can add them to your G Suite or Cloud Identity account. Depending on how you add the domain, users can have an email address or user account at one or more domains. Learn more about multiple domains. 

A domain alias is a domain name that can be used as an alternate name for another domain. With G Suite, domain aliases can give users an email address at another domain. 

To give all your users an alternate email address at another domain, add the domain as a domain alias. Adding the domain solarmora.com as an alias to example.com, gives bob@example.com another email address at bob@solarmora.com. 

If the domain you're adding has its own set of users, add it as an secondary domain. Users can have email addresses and accounts at their domain.

Learn more about adding domains and limitations with multiple domains.

Domains and organizational units are just two different ways to organize your users: You add users to a domain to give them an email address and user account. You add users to organizational units to give them access to different features and services.

An organizational unit can include users from different domains. For example, you might have a Marketing unit containing users from two domains. Learn more about organizational units and limitations with multiple domains.

You can use the G Suite Admin SDK (requires some programming experience) to add domain aliases to secondary domains. 

Yes, depending on your type of G Suite account. Follow these steps to change your primary domain. 

When you sign up, you provide a domain name that becomes the primary domain associated with your G Suite or Cloud Identity. After that, you can add your other domains using your Google Admin console. You add the domain as either an secondary domain or domain alias. In either case, you must own the domain name and verify your ownership. For instructions, see Add multiple domains.

You can have up to 600 domains to your organization's G Suite or Cloud Identity Premium account. The limit includes:

• One primary domain (with up to 20 domain aliases)—Your primary domain is the domain name you provide when you sign up. You can add up to 20 other domains to this domain as domain aliases. Domain aliases allow users to send mail with an email address at another domain. For example, you might have 2 different products each with their own domain. Having a domain alias for these domains will allow people to send mail using an address from either domain.
• 599 secondary domains—If your organization owns more than one domain, each with its own set of users, you can add each domain as a separate domain. Users will have an email address and Google Account at their respective domain. And, no matter what domain they have, they can still collaborate internally (with all other users) using your Google services.

For recommendation about setting up and managing multiple domains, check the G Suite for Education: Deployment Guide. 

Yes. As long as the SSO system is configured to identify the user by email address, it works smoothly for Google Accounts with multiple domains. (Learn more about SSO.)

Not currently. Instead, we recommend that you choose the account that has the domain you want to use as your primary domain. Then remove the domains from your other accounts and add them to this one account. For details, see Merge domains from separate accounts.

Not directly. Instead, you must remove the domain alias from your account, then add the same domain back as a new secondary domain. You can then swap the secondary domain with your primary domain. For details, see Change your primary domain.

Your Google Admin console doesn't have separate configuration settings for each of your domains. But you can tailor settings by placing the users in their own organizational unit, then applying settings to that unit. For details, see About user and device policies.