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by lunarg on January 8th 2014, at 14:34

To allow an Exchange user to send from an external e-mail address, perform the following steps:

  1. Create a Mail Contact with the correct external e-mail address in AD and in Exchange.
  2. Open Exchange Management Shell and set up the permissions:
    Get-MailContact MyUser@MyExternalDomain.com | Add-ADPermission -User MyUser@MyLocalDomain -AccessRights ExtendedRight -ExtendedRights "Send As"
    Replace the first e-mail address with the external one, the second part contains the user you wish to assign the permission to.
 
 
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