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Applies to: Exchange Server 2016

This cmdlet is available only in on-premises Exchange Server 2016.

Use the Add-FederatedDomain cmdlet to configure a secondary domain with the federated organization identifier in the federation trust for the Exchange organization.

The domains being added to the federation trust must exist as accepted domains in the Exchange organization.

For information about the parameter sets in the Syntax section below, see Syntax.

Add-FederatedDomain -DomainName <SmtpDomain> [-Identity <OrganizationIdParameter>] [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-WhatIf [<SwitchParameter>]]

This example adds the domain Contoso.co.uk to the existing federation trust.

Add-FederatedDomain -DomainName Contoso.co.uk

You can add any registered Internet domain to the federated organization identifier. You must prove domain ownership by creating a TXT record in the Domain Name System (DNS) zone of each domain you add.

For more details, see Federation.

You need to be assigned permissions before you can run this cmdlet. Although all parameters for this cmdlet are listed in this topic, you may not have access to some parameters if they're not included in the permissions assigned to you. To see what permissions you need, see the "Federation trusts" entry in the Exchange infrastructure and PowerShell permissions topic.


Parameter Required Type Description




The DomainName parameter specifies the secondary domain to be configured.




The Confirm switch specifies whether to show or hide the confirmation prompt. How this switch affects the cmdlet depends on if the cmdlet requires confirmation before proceeding.

  • Destructive cmdlets (for example, Remove-* cmdlets) have a built-in pause that forces you to acknowledge the command before proceeding. For these cmdlets, you can skip the confirmation prompt by using this exact syntax: -Confirm:$false.

  • Most other cmdlets (for example, New-* and Set-* cmdlets) don't have a built-in pause. For these cmdlets, specifying the Confirm switch without a value introduces a pause that forces you acknowledge the command before proceeding.




The DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory. You identify the domain controller by its fully qualified domain name (FQDN). For example, dc01.contoso.com.




The Identity parameter is reserved for internal Microsoft use.




The WhatIf switch simulates the actions of the command. You can use this switch to view the changes that would occur without actually applying those changes. You don't need to specify a value with this switch.

To see the input types that this cmdlet accepts, see Cmdlet Input and Output Types. If the Input Type field for a cmdlet is blank, the cmdlet doesn’t accept input data.

To see the return types, which are also known as output types, that this cmdlet accepts, see Cmdlet Input and Output Types. If the Output Type field is blank, the cmdlet doesn’t return data.

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