@didier I'm not sure I understand.
You are saying you want to send the registration email yourself, not automatically with FusionAuth?
(There are two possible verification emails. One is for a user creation, which verifies their email whenever someone creates a user, for any application. Another is for registration verification, which again checks their email but only when someone registers for a certain application.)
If that is the case, use the skipVerification and skipRegistrationVerification settings if using the API. There are analogous settings in the admin UI as well.
More documentation here: https://fusionauth.io/docs/v1/tech/apis/registrations#create-a-user-and-registration-combined
and here: https://fusionauth.io/docs/v1/tech/core-concepts/applications#registration
and here: https://fusionauth.io/docs/v1/tech/core-concepts/tenants#email