[otrs] Email notification to system email address

Hi I am in the process of configuring an OTRS system. When a user responds to a customer with an email, two emails are sent - one to the customer and another to one of the system email addresses. I would like to disable the email to the system email address. Using values to explain: Email addresses: - address1 - address2 - address3 Queues: - queue1 - queue2 - queue3 Ticket: - from customer@address - resides in queue 2 User responds to ticket. Two emails are sent: one to customer@address and another to address1. So the question is how to disable the email to the system email address when a response is sent to a customer. Thank you for any advice. Matthew Fincham