Can’t remove the domain ‘domain.com’ because it’s referenced in an email address policy by the proxy address template ‘smtp:@domain.net’.

If you’re having issues removing an existing domain from Exchange due to the error in the title, try the following:

  1. On your Domain Controller, open ADSI Edit
  2. Select “Action” in the top bar
  3. Select “Connect To…”
  1. In the new window, in the dropdown box named “Select a well known Naming
  2. Context” and select “Configuration” Click “OK” on the Connection Settings window
  3. Double click on the new tree in the left side-pane to expand Navigate through this tree as follows:
    CN=Configuration,DC=Company,DC=local >
    CN=Services >
    CN=Microsoft Exchange >
    CN=COMPANY >
    CN=Recipient Policies
  4. Double click on CN=Default Policy to edit
  5. Scroll through the new window “Attribute Editor” until you find “gatewayProxy”
  6. Edit the gatewayProxy to remove the offending domain name.

Hopefully that helps you, if not, god speed.

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