Prestashop 1.6 - How to stop sending Payment Processed emails for free orders?

Question

In Prestashop 1.6, when ordering a free product, the client still gets sent a "Payment Processed" email. I would like to stop this from happening. Can anyone give me a hint as to where to look or what to do?

Answer 1

Confirmation email is sent in paymentmodule class (funcion validateOrder);