[otrs] Tickets ReOpening

Is there any way to disable the reopening of tickets by email once they are already closed? There are people at the place that I work that forget to remove the system address from the CC when closing out a ticket and therefore it just reopens the ticket again. I don't want to remove the autofill CC feature because sometimes there are 4 or 5 people in that CC list. I just need for it to not be able to reopen via email once it is closed. Thanks