Applies to: Exchange Server 2010

Topic Last Modified: 2011-03-19

Use the New-X400AuthoritativeDomain cmdlet to create and specify the X.400 authoritative domain for the Microsoft Exchange Server 2010 organization. The X.400 authoritative domain defines the standard fields for the namespace appended to the recipient identity for all mailboxes assigned an X.400 address.

New-X400AuthoritativeDomain -Name <String> -X400DomainName <X400Domain> [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-WhatIf [<SwitchParameter>]] [-X400ExternalRelay <$true | $false>]

Parameter Required Type Description




The Name parameter specifies a unique name for an X.400 authoritative domain object. When you specify a name that includes spaces, you must enclose the name in quotation marks ("), for example, "Display Name". The Name parameter can't exceed 64 characters.




The X400DomainName parameter specifies the X.400 namespace, which can only include the X.400 organizational components. Specifically, only the following attribute types are supported:

  • Label (Abbreviation)
  • C (Country)
  • A (ADMD)
  • P (PRMD)
  • O (Organization)
  • OU1 (Organization unit 1)
  • OU2 (Organization unit 2)
  • OU3 (Organization unit 3)
  • OU4 (Organization unit 4)

The address attributes must be separated by semicolons, and the address must be enclosed in quotation marks ("), for example,





The Confirm switch causes the command to pause processing and requires you to acknowledge what the command will do before processing continues. You don't have to specify a value with the Confirm switch.




The DomainController parameter specifies the fully qualified domain name (FQDN) of the domain controller that writes this configuration change to Active Directory. The DomainController parameter isn't supported on the Edge Transport server role. The Edge Transport server role writes only to the Active Directory Lightweight Directory Services (AD LDS) instance.




The WhatIf switch instructs the command to simulate the actions that it would take on the object. By using the WhatIf switch, you can view what changes would occur without having to apply any of those changes. You don't have to specify a value with the WhatIf switch.




The X400ExternalRelay parameter specifies this authoritative domain as an external relay domain. If you set the X400ExternalRelay parameter to $true, Microsoft Exchange routes e-mail to the external address and doesn't treat resolution failures to this subdomain as an error.

X.400 domain names can only include the following ASCII characters:

  • A to Z
  • a to z
  • 0–9
  • These punctuation and special characters: (space) ' () + , - . / : = ?

You can use the following X.400 attributes (one each per address):

  • Name   country
    • Abbreviation   C
    • Maximum character length   2
  • Name   administrative domain
    • Abbreviation   A
    • Maximum character length   16
  • Name   private domain
    • Abbreviation   P
    • Maximum character length   16
  • Name   organization name
    • Abbreviation   O
    • Maximum character length   64
  • Name   organizational unit name
    • Abbreviation   Ou1-4
    • Maximum character length   32

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 "X.400 domains" entry in the Transport Permissions topic.

This example creates the X.400 authoritative domain Sales in the private domain Contoso, which is under the administrative domain Fabrikam.

New-X400AuthoritativeDomain -Name Sales -X400DomainName "C=US;A=Fabrikam;P=Contoso;O=Sales"

This example creates an external relay domain for the X.400 namespace Europe organizational unit (OU) under the Sales organization in the private domain Contoso, which is under the administrative domain Fabrikam.

New-X400AuthoritativeDomain -Name "Sales Europe" -X400DomainName "C=US;A=Fabrikam;P=Contoso;O=Sales;OU1=Europe" -X400ExternalRelay: $true