You can easily customize all ticket email templates by going to Settings->Email Templates->Support

Here is a list of all ticket email templates:

• New open ticket (opened by staff, sent to customer) – (Sent to the customer when the ticket is opened from the admin area)
• Response to ticket (sent to customer) – When the admin adds a response to the ticket, this email will be sent to the customer.
• Ticket response (opened by customer and sent to staff members) – When the customer responds to the ticket and an email will be sent to all staff members, which service is the same as ticketing service.
• Auto-response for opening a new ticket – (When the customer opens a new ticket auto-reply message)
• New ticket created (opened by custom, sent to staff members) – (When a new ticket is opened by the customer, all staff members whose service is the same as that of the ticketing service receive this email )
• Automatic closing ticket – This email will be sent when cron automatically closes the ticket.

Please feel free to deactivate any of the email templates if you do not wish to be sent.