Powershell to list users who have mailbox restrictions

Hi Folks,

I am trying to use powershell to give me a list of all users in my organization who have delivery restrictions. I found this:

Get-Mailbox-Filter {AcceptMessagesOnlyFrom-ne$Null}

But when I run it it returns on e user mailbox. I have over 2500 mailboxes and at least one fourth of them have restrictions.

Any help would be appreciated