Additional domains FAQ

Help me understand

What is multiple domain support?

If you own multiple Internet domains, you can associate them all with your organization's Google Account at no extra cost. Depending on how you add the domain, users can have an identity at one or more domain. They can share Google services. And you manage them from the same Google Admin console. To get started, see Managing all your domains.

What is a domain alias?

The legacy free edition of G Suite supports domain aliases but not secondary domains.

A domain alias is a domain name that can be used as an alternate name for another domain.  When used with a Google Account, domain aliases can either give users an email address at another domain. Or they can be used to set up dual email delivery, for example, if you want to test drive Gmail against your legacy mail program.

As with any other domain you use with Google services, you must own the domain name and verify your ownership.

What is a whitelisted domain?

A whitelisted domain is an external trusted domain that you add in your Domain settings to allow users in your organization to share files with users in that trusted domain. Your users can also receive files from users of the trusted domain.

After you whitelist a trusted domain, users can invite people from that domain to view, comment on, and edit their files. A warning message is turned on by default that asks users to confirm before they share files with a whitelisted domain.

For details, see Whitelist trusted domains for G Suite.

What's the difference between adding a domain vs. domain alias?

To give all users in your domain an alternate email address at another domain, add the domain as a domain alias. Adding the domain as an alias to, gives another email address at Learn more about adding a domain alias

If the domain you're adding instead has its own set of users, add it as a separate domain. Users can have email addresses and Google Accounts at their respective domain. And they can collaborate internally using your Google services. Learn more about adding a separate domain

How do multiple domains relate to organizational units used to manage user policies?

There is no relationship. Domains and organizational units are just two different ways to organize your users. You add users to a domain to give them a common email address and account name. You add them to organizational units to give them access to different features and services. An organizational unit can include users from different domains and vice versa. For example, you might have a Marketing unit containing users from two domains. Learn more about organizational units.

How it works

How do I add domains to my organization's Google Account?

When you sign up for Google Service, you provide a domain name that becomes the primary domain associated with your Google Account. After that, you can add your other domains using your Google Admin console. You add the domain as either a separate domain or domain alias. In either case, you must own the domain name and verify your ownership. For instructions, see Add a domain or domain alias.

Note: There are a few limitations with non-primary domains so we recommend that you choose your primary domain carefully.

How many domains can I add?

You can add up to 600 domains to your organization's Google 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 for a Google Cloud product. 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 non-primary (separate) 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.
Can we use multiple domains with Single Sign On (SSO)?

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.)

Can we merge domains at multiple Google accounts into one account?

Not at this time. 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.

Can I swap a domain alias with my primary domain?

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.

Can I configure service settings differently for my domains?

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

Is it possible to change the name of my primary domain?

Yes, you can change the name of your primary domain by swapping it with one of your secondary domains, using the Customers API. If you wish to use a newly-acquired domain, it must be added to your account as a secondary domain first.

Was this article helpful?
How can we improve it?