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About Domain Controllers
PMM allows your users to be distributed across multiple domains. In order for the system to authenticate users, the Gateway must be joined to a Domain Controller associated with your users' mail domains.
A Domain Controller is responsible for authenticating your users and providing the Gateway with user information. If a user is accessing the PMM Portal from an unrecognized domain, their login will be unsuccessful unless the Domain Controller has been correctly configured.
You can configure a number of Domain Controllers for authenticating PMM users on behalf of the Gateway. For more information on authenticating PMM users see PMM User Authentication Settings.
Managing Domain Controllers
