Email customer

Hi, I’m trying to send an automatic email when booking. I configured everything correctly and even followed this advice. But the email is not sent (it’s a yahoo address)

https://www.ads-software.com/support/topic/default-emails-not-sending/

My website

https://www.wakeboardskinautiquesnlp.com/resa/

Screenshot

https://snipboard.io/vN3JXZ.jpg

The page I need help with: [log in to see the link]