Hi,all I want to write a program that can send some e-mails automaticlly,i use the code like this: def sendmail(authenticationUsername, authenticationSecret,fromAddress, toAddress,messageFile,smtpHost, smtpPort=25): resultDeferred = Deferred() senderFactory = ESMTPSenderFactory(authenticationUsername,authenticationSecret,fromAddress,toAddress,messageFile,resultDeferred,requireTransportSecurity=False) reactor.connectTCP(smtpHost, smtpPort, senderFactory) return resultDeferred def sendComplete(result): print "Message sent." reactor.stop() class EmailUtil: def __init__(self,popserver,smptserver,username,password): self.popserver=popserver self.smtpserver=smptserver self.username=username self.password=password def goSend(self,fromaddr, toaddr, subject, body, filenames): message = buildMessage(fromaddr, toaddr, subject, body, filenames) messageData = message.as_string(unixfrom=False) tempfile=open('temp.mai','wb') tempfile.write(messageData) tempfile.close() print 'Sending.....' result = sendmail(self.username,self.password,fromaddr,toaddr,file('temp.mai'),self.smtpserver) result.addCallbacks(sendComplete,handleError) reactor.run() if __name__=='__main__': f=EmailUtil('','smtp.xxx.com','xxxx','1234') filenames=['test2.docx'] f.goSend('xxxx@xxx.com','xxx@hotmail.com','testSend','aaaaaaaaaa',filenames) f.goSend('xxxx@xxx.com','xxx@hotmail.com','testSend','aaaaaaaaaa',filenames) f.goSend('xxxx@xxx.com','xxx@hotmail.com','testSend','aaaaaaaaaa',filenames) I try to send the same mail,but after the first mail was sended,the program deadlock,and i use some tool konws after the first mail sended,no packets was send to the outside world.I guess maybe the problem related with the reactor run and stop,but i am sure,any one can tell me what's problem is?Thanks