from twisted.application import service application = service.Application("SMTP Client Tutorial") from twisted.application import internet from twisted.internet import protocol from twisted.mail import smtp class SMTPClientFactory(protocol.ClientFactory): protocol = smtp.ESMTPClient def buildProtocol(self, addr): return self.protocol(secret=None, identity='example.com') smtpClientFactory = SMTPClientFactory() smtpClientService = internet.TCPClient('localhost', 25, smtpClientFactory) smtpClientService.setServiceParent(application)