code: def _login_authentication(self, login, password, authz_id=""):
          
          extralines = [b'"%s"' % base64.b64encode(login.encode("utf-8")),
                        b'"%s"' % base64.b64encode(password.encode("utf-8"))]
          code, data = self.__send_command("AUTHENTICATE", [b"LOGIN"],
                                           extralines=extralines)
          if code == "OK":
              return True
          return False
docs: SASL LOGIN authentication
  
          :param login: username
          :param password: clear password
          :return: True on success, False otherwise.