Hi,

you can deactivate the ticket created email notification to customer while creating a new helpdesk ticket by following the below steps.

1. Go to settings and activate developer mode.

2. Then get into the Helpdesk application and Configuration -> Stages.

3. Then Click the New stage from the list of stages that shown in the list view and remove the Email Template and save.

Now the email will not send when you create a new ticket.

Hope this helps.

Thanks.

https://www.odoo.com/forum/help-1/helpdesk-remove-ticket-reception-acknowledgment-email-245442