Hub Transport Setup Fails With Accepted Domain Already Exists Error

Exchange 2007

Microsoft Exchange Server 2007 will reach end of support on April 11, 2017. To stay supported, you will need to upgrade. For more information, see Resources to help you upgrade your Office 2007 servers and clients.


Applies to: Exchange Server 2007

Topic Last Modified: 2015-03-09

This topic provides information about how to troubleshoot Microsoft Exchange Server 2007 Setup if Setup fails while installing the Hub Transport server role with the following error:


[ERROR] The accepted domain already exists

The actual domain name in the error message will vary depending on your configuration.

This issue occurs if all of the following conditions are true:

  • You have configured an accepted domain that has a wildcard (for example, * to accept messages for that domain and all of its subdomains.

  • You have configured an e-mail address policy that uses the same domain name for generating e-mail addresses (for example,

  • You are running the release to manufacturing (RTM) version of Exchange Server 2007.

To resolve this problem, do one of the following:

  • Upgrade to Microsoft Exchange 2007 Service Pack 1.

  • Do not use wildcards when configuring accepted domains. Explicitly specify each subdomain that you use in your e-mail address policies as an accepted domain. For step by step instructions about configuring accepted domains, see How to Create Accepted Domains.

To learn more about managing accepted domains, see Managing Accepted Domains.

To learn more about managing e-mail address policies, see Managing E-Mail Address Policies.