We have Odoo 13 installed on-premises and are creating Helpdesk tickets via the API. When creating a ticket, we set various fields, including the partner's email. However, no email is being sent to the partner automatically.

We would expect the partner to receive an email with content like "Your request has been received... your ticket number is XY".

What settings need to be configured in Odoo Helpdesk to enable automatic email sending in this scenario? Or do we need to trigger the email sending via the API as well and if so, how?

Any guidance on how to achieve this automated email notification when creating tickets through the API would be greatly appreciated.