Hi @arnaudf,
Thank you for your response and clarification.
First, let me clarify that the Passwordless Email Connection does not support sending verification emails.
I mentioned in this post that during my tests, I confirmed it is not possible to send a verification email to a Passwordless Email User.
The sign-in email, however, cannot be prevented since it contains a link/code sent to the user to proceed with the login.
Does that answer your question?
Thank you.