Laravel 5.4 password reset using ajax

I have this code:

 $.ajax({
               url:"/password/email", 
               data: {
                     _token: $(".modal-forgotpass-content input[name='_token']").val(),
                     email: $(".modal-forgotpass-content input[name='email']").val()
                },
                type: "POST",
                success: function(data) {
                    alert("Successful : link send");
                },
                error: function(e) {
                     alert("Faild: link not send");
                }

Controller (this function is coming with laravel 5.4) :

 public function sendResetLinkEmail(Request $request)
    {
        $this->validate($request, ['email' => 'required|email']);

        // We will send the password reset link to this user. Once we have attempted
        // to send the link, we will examine the response then see the message we
        // need to show to the user. Finally, we'll send out a proper response.
        $response = $this->broker()->sendResetLink(
            $request->only('email')
        );

        return $response == Password::RESET_LINK_SENT
                    ? $this->sendResetLinkResponse($response)
                    : $this->sendResetLinkFailedResponse($request, $response);
    }

Routes :

Auth::routes();

this code its work well ,but he send password reset link to all emails even if the email not exist in database(users table) i want the link to be sent only to the emails already exist in user table any help? Thank you

via Ilham Guezzoula