Limitations with multiple domains
When you add a domain to your Google Apps account, you need to keep in mind some limitations so that you can set up the primary and secondary domains correctly. The following topics discuss different features for primary and secondary domains:
Google Admin console:
- You can't set different policies or configuration settings for different domains. All settings in the Google Admin console apply to all domains that are part of your account.
- You can specify only one logo for your domains. The same logo appears for users in all domains that are part of your account.
Domain names and aliases
- Domain aliases are supported for the primary domain only. You can't create a domain alias for any other domain. If users in a non-primary domain need alternate email addresses like the ones created by a domain alias, you can use the Admin console or the Provisioning API to give each user an email alias at the target domain. For example, instead of defining alias.com as a domain alias for domain.com, you can add domain.com and alias.com to your account as separate domains, and then create an email alias firstname.lastname@example.org for each email@example.com.
- Google Apps account merge is not supported. Some current Google Apps customers with multiple domains have separate Google Apps accounts for each domain. Google does not currently support merging multiple Google Apps accounts into a single multiple domain account.
- Migration from domain aliases is not supported. Some current Google Apps customers use domain aliases for their non-primary domains. Google does not currently support the conversion of domain aliases into multi domain accounts.
- In the legacy free edition of Google Apps, secondary domains are not supported. The legacy free edition of Google Apps only supports domain aliases. All the other restrictions tied to domain aliases apply.
Account access URLs
- You cannot create a global URL for accessing Google Apps. Users access Google Apps with a URL that includes the domain name from their email address, for example http://docs.google.com/a/subsidiaryA.com. You can't provide a global URL that users from all domains share.
- Secondary domain users can't use the link in a calendar sharing notification email. When a user shares a calendar with users in a secondary domain, the users in the secondary domain can't click the link in the notification email to add the calendar. They must enter the shared calendar address in the Add a co worker's calendar box to add it.
You can't restrict sharing to users in a single domain. Sharing options are based on the organization as a whole (or organizational units with some Google Apps editions), not individual domains. With Google Apps Unlimited, Google Apps for Education, or Google Apps for Nonprofits, you can create an organizational unit for everyone at a particular domain and then restrict sharing for that organizational unit.
To share a document with the users in a single domain (or any other subset of users), create a Google Group that includes all the users and share the document with that group.
- You can only create custom web address mapping for a site at the primary domain.
- Searches for sites return sites only in the same domain as the user. For example, a user with an address in a secondary domain will not find sites created in the primary domain.
Google App Engine
- Applications that use Google App Engine are not available for users at non primary domains.
Postini for Google Apps
- Existing Google Apps domains that use the Postini for Google Apps service are unable to add secondary domains.