Python之SMTP详解
fmms
12年前
这段代码解释了SMTP在python中的基本应用。
- 获得服务器的特性，如：允许发送的邮件大小。
- 查看服务器是否支持SSL和TLS安全传输。
- 查看在发送邮件之前是否需要认证。
#!/usr/bin/env python #-*-coding = UTF-8-*- #SMTP_email.py #auth@:xfk #date@:2012-04-30 import sys import smtplib import socket from getpass import getpass if len(sys.argv) < 4: print "[*]usage:%s server fromaddr toaddr " % sys.argv[0] sys.exit(1) server = sys.argv[1] fromaddr = sys.argv[2] toaddr = sys.argv[3] message = """ TO: %s From: %s Subject: Test Message from SMTP_mail.py Hello ,This a simple SMTP_mail example. """ % (','.join(toaddr),fromaddr) def get_size(): """获得服务器允许发送邮件的大小""" try: s = smtplib.SMTP(server) #连接到服务器 code = s.ehlo()[0] #返回服务器的特性 usesesmtp = 1 if not (200 <= code <=299): #在200到299之间都是正确的返回值 usesesntp = 0 code = s.helo()[0] if not (200 <= code <=299): raise SMTPHeloError(code,resp) if usesesmtp and s.has_extn('size'): #获得服务器允许发送邮件的大小 print "Maxinum message size is ",s.esmtp_features['size'] if len(message) > int(s.esmtp_features['size']): print "Message too large;aborting." sys.exit(2) s.sendmail(fromaddr,toaddr,message) except(socket.gaierror,socket.error,socket.herror,smtplib.SMTPException),e: print "***Your message may not have been sent!" print e sys.exit(1) else: print "***Message successful sent to %d recipient(s)" % len(toaddr) def ssl_tls(): """使用SSL安全套阶层和TLS安全传输层进行邮件传输，确保密码在传输中的安全""" try: s = smtplib.SMTP(server) #连接到服务器 code = s.ehlo()[0] #返回服务器的特性 usesesmtp = 1 if not (200 <= code <=299): #在200到299之间都是正确的返回值 usesesntp = 0 code = s.helo()[0] if not (200 <= code <=299): raise SMTPHeloError(code,resp) if usesesmtp and s.has_extn('starttls'): #查看服务器是否支持TLS print "Negotiating TLS......" s.starttls() code = s.ehlo()[0] if not (200 <= code <=299): #在支持TLS的服务器上是否连接回话成功 print "Couldn't EHLO after STARTTLS." sys.exit(5) print "Using TLS connection." else: print "Server does not suport TLS; using normal connection." s.sendmail(fromaddr,toaddr,message) #如果连接TLS成功则使用加密传输；若连接TLS出错则使用普通的传输 except(socket.gaierror,socket.error,socket.herror,smtplib.SMTPException),e: print "***Your message may not have been sent!" print e sys.exit(1) else: print "***Message successful sent to %d recipient(s)" % len(toaddr) def auth_login(): """当发送邮件时，服务器需要验证，则输入用户名密码方可发送邮件""" sys.stdout.write("Enter username: ") username = sys.stdin.readline().strip() password = getpass("Enter password: ") try: s = smtplib.SMTP(server) #连接到服务器 code = s.ehlo()[0] #返回服务器的特性 usesesmtp = 1 if not (200 <= code <=299): #在200到299之间都是正确的返回值 usesesntp = 0 code = s.helo()[0] if not (200 <= code <=299): raise SMTPHeloError(code,resp) if usesesmtp and s.has_extn('auth'): #查看服务器是否支持认证 print "Using Authentication connect." try: s.login(username,password) except smtplib.SMTPException,e: print "Authentication failed:",e sys.exit(1) else: print "Server does not suport Authentication; using normal connect." s.sendmail(fromaddr,toaddr,message) #如果支持认证则输入用户名密码进行认证；不支持则使用普通形式进行传输 except(socket.gaierror,socket.error,socket.herror,smtplib.SMTPException),e: print "***Your message may not have been sent!" print e sys.exit(1) else: print "***Message successful sent to %d recipient(s)" % len(toaddr) if __name == "__mian__": get_size() ssl_tls() auth_login()