Remove AcceptMessagesOnlyFrom restriction

I've got a resource mailbox with the restriction set to only accept messages from certain people.  This was set in Exchange 2010 through the GUI and I cannot find that in 2013.  Does anybody know how to remove this restriction?  I know how to and and remove from the list but need to totally remove the restriction so that it will accept messages from anyone.

Thanks,
Tom
tomjhellerAsked:
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AmitIT ArchitectCommented:
It  can be changed from both GUI and EMS. Follow this:

Open EAC>Recipients>Mailboxes>Edit>Mailbox Features>Message Delivery Restrictions>View Details

Change according to your need. Select All Senders in your case.

Click Ok>Close the page and click save.

Ref:
https://technet.microsoft.com/en-us/library/bb397214(v=exchg.150).aspx
tomjhellerAuthor Commented:
This will work for a regular mailbox but not a Resource Mailbox.  Resource Mailboxes do not show up under mailboxes, you have to go to the resources tab.    Mail Delivery Restrictions is not an option for a Resource Mailbox.  I'm able to add/remove users using the shell but now I want to totally remove the setting.
Amit KumarCommented:
Steps given by Amit also works I think. try using powershell:

Set-Mailbox -DisplayName "Conf Room" -AcceptMessagesOnlyFrom:$null

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AmitIT ArchitectCommented:
KB shows, that get-mailbox and set-mailbox can be used for these type of mailbox. Can you run

get-mailbox -identify resouremailboxname | fl

Post here.
Amit KumarCommented:
If set-mailbox command works for you then you can check results by below command:

get-mailbox -DisplayName "Conf Room" | ft *accept*

If there is no account then it will show you NULL value. then check and confirm
tomjhellerAuthor Commented:
I have  been using set-mailbox to and/remove users.  I appears that setting it to null removes the restriction.  I was able to verify this by comparing results from the get-mailbox -identify resouremailboxname | fl command on different resources.

Thanks guys!
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