Thanks for your reply,but my issue is when people create an account alone, not when I create myself an account from the backend (which never happen).
To be sure to understand what you said, i just test to create an account with this unchecked box, it's work, but when i create an account from the frontend, as a normal people, I still receive an email from WP.
Any info about that ?
Thanks for your help ! 🙂