Python使用poplib模块和smtplib模块收发电子邮件的教程

#-*- encoding: gb2312 -*-
import os, sys, string, socket
import smtplib


class SMTP_SSL (smtplib.SMTP):
  def __init__(self, host='', port=465, local_hostname=None, key=None, cert=None):
    self.cert = cert
    self.key = key
    smtplib.SMTP.__init__(self, host, port, local_hostname)
    
  def connect(self, host='localhost', port=465):
    if not port and (host.find(':') == host.rfind(':')):
      i = host.rfind(':')
      if i >= 0:
        host, port = host[:i], host[i+1:]
        try: port = int(port)
        except ValueError:
          raise socket.error, "nonnumeric port"
    if not port: port = 654
    if self.debuglevel > 0: print>>stderr, 'connect:', (host, port)
    msg = "getaddrinfo returns an empty list"
    self.sock = None
    for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):
      af, socktype, proto, canonname, sa = res
      try:
        self.sock = socket.socket(af, socktype, proto)
        if self.debuglevel > 0: print>>stderr, 'connect:', (host, port)
        self.sock.connect(sa)
        # 新增加的创建ssl连接
        sslobj = socket.ssl(self.sock, self.key, self.cert)
      except socket.error, msg:
        if self.debuglevel > 0: 
          print>>stderr, 'connect fail:', (host, port)
        if self.sock:
          self.sock.close()
        self.sock = None
        continue
      break
    if not self.sock:
      raise socket.error, msg

    # 设置ssl
    self.sock = smtplib.SSLFakeSocket(self.sock, sslobj)
    self.file = smtplib.SSLFakeFile(sslobj);

    (code, msg) = self.getreply()
    if self.debuglevel > 0: print>>stderr, "connect:", msg
    return (code, msg)
    
if __name__ == '__main__':
  smtp = SMTP_SSL('192.168.2.10')
  smtp.set_debuglevel(1)
  smtp.sendmail("zzz@xxx.com", "zhaowei@zhaowei.com", "xxxxxxxxxxxxxxxxx")
  smtp.quit()

这里我是从原来的smtplib.SMTP派生出了新的SMTP_SSL类，它专门来处理ssl连接。我这里测试的192.168.2.10是我自己的测试服务器.
第二种是新增加了starttls的命令，这个很简单，smtplib里就有这个方法，叫smtplib.starttls()。当然，不是所有的邮件系统都支持安全邮件的，这个需要从ehlo的返回值里来确认，如果里面有starttls，才表示支持。相对于发送普通邮件的第二种方法来说，只需要新增加一行代码就可以了:

#-*- encoding: gb2312 -*-
import os, sys, string
import smtplib
import base64

# 邮件服务器地址
mailserver = "smtp.163.com"
# 邮件用户名
username = "xxxxxx@163.com"
# 密码
password = "xxxxxxx"
# smtp会话过程中的mail from地址
from_addr = "xxxxxx@163.com"
# smtp会话过程中的rcpt to地址
to_addr = "yyyyyy@163.com"
# 信件内容
msg = "my test mail"

svr = smtplib.SMTP(mailserver)
# 设置为调试模式，就是在会话过程中会有