python发送文本邮件

 #!/usr/bin/env python
 #coding=utf-8
 #Author: Ca0Gu0
 import time
 import smtplib
 from email.mime.text import MIMEText

 class MailCli(object):
     def __init__(self):
         self.s = smtplib.SMTP()             #类实例化

     def connect(self, host=None, port=25):
         self.s.connect(host, port)          #连接邮件服务器

     def login(self, user=None, passwd=None):
         self.user = user
         self.s.login(user, passwd)          #登陆帐户跟密码

     def send(self, subject=None, content=None, to=None):
         froms = self.user+'<%s>' %(self.user)
         msg = MIMEText(content)             #处理发件内容
         msg['Subject'] = subject            #处理发件主题
         msg['From'] = froms                 #处理发件人地址
         msg['To'] = to                      #处理收件人地址
         self.s.sendmail(froms, to, msg.as_string())   #发送邮件内容
         return "OK"

     def close(self):
         self.s.close()                                     #退出登陆
         return ''                                        #显示发信成功

 if __name__ == "__main__":
     host = "mail.xxx.com"
     port = 25
     user = "caoguo@xxx.com"
     passwd = "password"
     to = "caoguo@163.com"

     r=MailCli()
     r.connect(host=host,port=port)
     r.login(user=user, passwd=passwd)

     for i in range(10):                                  #连续发生10封邮件

         subject = "Testing SMTP Authentication "+ str(i)
         content = "This mail tests SMTP Authentication" + str(i)
         returns = r.send(subject=subject, content=content, to=to)
         print time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(time.time())),returns
     r.close()