Room Mailbox - When creating a meeting request, the Room Mail Box Alias message returns with Delivery Failure

Question

Good Day,
Hopefully someone here has the know why on this one.
I have setup the Room Mailbox as per several online tutorials. From my Outlook 2013 I can access the room and its calendar.
But when I create a new meeting request, I add myself as an Attendee for testing purposes. When I select the room from the rooms button. It adds the room mailbox [email protected] to the attendee list.
When I click send, the alias address returns as below:
Delivery has failed to these recipients or groups:
 Principals Office ([email protected]) There's a problem with the recipient's mailbox. Please try
resending the message. If the problem continues, please contact your helpdesk.
Diagnostic information for administrators:
 Generating server: EXCHANGE.ourdomain.LOCAL
 [email protected] #550 5.2.0 RESOLVER.FWD.NotFound; misconfigured forwarding address ##
 Original message headers:
 Received: from EXCHANGE.ourdomain
.LOCAL ([10.10.1.3]) by exchange  ([10.10.1.3]) with mapi id 14.01.0438.000; Fri, 31 Jan 2014 14:15:26 +0200 Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary From: "Chadley L. Wilson" <[email protected]>
Subject: Canceled: test 43 Thread-Topic: test 43 Thread-Index: Ac8eeG1lL8A9HdusTwmNIg6lVDeCaQABbBnA Importance: high X-Priority: 1 Date: Fri, 31 Jan 2014 14:15:25 +0200 Message-ID: <E7EC80BFFFA86E4086FDCE3C18EFBDD79ACCDF1C@exchange> Accept-Language:
en-GB, en-ZA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: <E7EC80BFFFA86E4086FDCE3C18EFBDD79ACCDF1C@exchange> MIME-Version: 1.0 X-Originating-IP: [10.10.1.33]
In the Exchange EMC I have setup the everything as per the following link:
http://exchangeserverpro.com/exchange-server-2010-room-mailboxes-step-by-step-guide/
I have also use created a room list and added the rooms to it. They show upo in my outlook.
I have rebooted the server and tried various permissions and option settings in Outlook with no luck. I even tried enabling the user account in AD. Nothing works and the email always comes back undeliverable.
One post I read suggested that In the Resource General tab that Enable the Resource booking attendant be ticked. Either way it doesn't get right of the problem.
Chad the Dad

Answer 1

Ok I see from the output below there were two problems fixed the first one, but I can't figure out how to correct this one:
The forwardingAddress is wrong. But I also do not know what it should be
Name                          : Principals Office
Alias                         : principalsoffice
ForwardingAddress             : ourdomain.LOCAL/Admins/John H. Robertson
ForwardingSmtpAddress         :
OfflineAddressBook            :
AddressListMembership         : {\All Mailboxes(VLV), \All Recipients(VLV)}
EmailAddresses                : {SMTP:[email protected]}
HiddenFromAddressListsEnabled : True
EmailAddressPolicyEnabled     : True
PrimarySmtpAddress            : [email protected]
WindowsEmailAddress           : [email protected]
DeliverToMailboxAndForward    : False
ForwardingAddress             : ourdomain.LOCAL/Admins/John H. Robertson
ForwardingSmtpAddress         :
Chad the Dad