[dev] Customer Notifications New Ticket/Closed Ticket

Hi all, Our OTRS is accessed only by agents, the customers send emails and the call center distribute this request to the different queues. I am looking to add a Customer Notification (By email) to say: 1) Your new request have the ticket number xxx, etc etc 2) Your ticket xxx is closed. Thanks etc etc I don't want to use the option "change status" because I am interested only in this 2 solutions. (New Ticket-Closed Ticket) Do you know where can I configure it? Thanks in advance Raoul