Affiliates Woocommerce Email Validation

add_action('woocommerce_created_customer', 'affiliates_woocommerce_created_customer' );

function affiliates_woocommerce_created_customer ( $user_id, $new_customer_data, $password_generated ) {
        if ($user_id != null) {
                if ( $group = Groups_Group::read_by_name( 'Registered' ) ) {
                        $result = Groups_User_Group::create( array( "user_id"=>$user_id, "group_id"=>$group->group_id ) );
                }
        }
}