Configure message delivery restrictions on a resource mailbox Exchange 2013

We just recent migrated from Exchange 2010 to 2013.  In 2010, our solution to only let certain people schedule meetings in a resource calendar was to only allow those people to send emails to it and hide it from the address book (long story).  My problem is that now that it's migrated to 2013 we had an Exec (who's admin usually does the scheduling) was denied because he didn't have permissions to send to that mailbox.  Problem is I cannot find anywhere where you can configure delivery restrictions on a resource mailbox. The old settings carried over but I cannot change them.  Any advice where to find these setting would be greatly appreciated!
tomjhellerAsked:
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CotillionCommented:
You should be able to do it via PowerShell

Set-Mailbox -Identity "NameOfResourceMailbox" -AcceptMessagesOnlyFrom "SpecificUserWithPermissions" -AcceptMessagesOnlyFromDLMembers "DLWithPermissions"

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suriyaehnopCommented:
Try give her the permission to book resource:

Set-CalendarProcessing -Identity "Car 53" -AutomateProcessing AutoAccept -BookInPolicy "ayla@contoso.com","tony@contoso.com"

https://technet.microsoft.com/en-us/library/dd335046(v=exchg.150).aspx
tomjhellerAuthor Commented:
Suriyaehnop -  That would not do it.  The user has always had permission to book the resource but in order to book it, you have to be able to email it.  

Cotillion - That actually what I did to get it to work.  I ran this command yesterday to add the person to the list.  Tested shortly after and didn't help but this morning I tested again and all was good.  I guess it just takes a while to take effect.
[PS] C:\Windows\system32>Set-Mailbox -Identity "Resource room" -AcceptMessagesOnlyFrom @
{add="User"}


Thanks ya'll for your help!
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