Skip Ribbon Commands
Skip to main content

How do I change the primary domain type in Office 365 from Authoritative to Internal Relay?

Last Update: 7/21/2017 11:32 AM
This article has been moved to our new Help Center. Please update your bookmarks.

​How do I change the primary domain type in Office 365 from Authoritative to Internal Relay?

Answer:

Here are the steps to make this change. These steps are important to follow when migrating Public Folders in hybrid mode.

  • Log in to the Office 365 admin portal as a Global Admin.
  • Launch Exchange Admin Center.
  • Under Mail Flow, select Accepted Domains.
  • Use the radio buttons to change the domain type. Choose Internal Relay: Email is delivered to recipients in this Exchange organization or relayed to an email server at another physical or logical location.

Here is a screenshot from the admin portal:

 Office 365

Note: There will be a warning about connectors. It is safe to dismiss this if you're only making this change to mail-enable your Public Folders.

Mail will now be successfully delivered.