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 Google Apps only supports domain aliases, 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 services 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's the difference between adding a domain vs. domain alias?

To give all users in your primary 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 the organizational structure used for user policy management?

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 Apps, 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 599 non-primary domains to your organization's Google account. You can also add up to 20 domain aliases to your primary domain.

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.)

My organization has domains at multiple Google accounts. Can we merge them into a single account?

Google recognizes this need, but merging accounts is not available 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 sign up for a new Google account using that domain as the 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.