def METHOD_NAME(self):
    """
    POP3 and SMTP each listen on a TCP4ServerEndpoint by default.
    """
    options = Options()
    options.parseOptions([])
    self.assertEqual(len(options["pop3"]), 1)
    self.assertIsInstance(options["pop3"][0], endpoints.TCP4ServerEndpoint)
    self.assertEqual(len(options["smtp"]), 1)
    self.assertIsInstance(options["smtp"][0], endpoints.TCP4ServerEndpoint)