python中利用smtplib发送邮件的3中方式 普通/ssl/tls

#!/usr/bin/python  
#  coding:utf-8   
import smtplib  
from email.MIMEText import MIMEText  
from email.Utils import formatdate  
from email.Header import Header  
import sys  
  
#设置默认字符集为UTF8 不然有些时候转码会出问题  
default_encoding = 'utf-8'  
if sys.getdefaultencoding() != default_encoding:  
    reload(sys)  
    sys.setdefaultencoding(default_encoding)  
   
#发送邮件的相关信息，根据你实际情况填写  
smtpHost = 'smtp.126.com'  
smtpPort = '25'  
sslPort  = '587'  
fromMail = '[email protected]'  
toMail   = '[email protected]'  
username = 'zhangsan'  
password = '123456'  
    
#邮件标题和内容  
subject  = u'[Notice]hello'  
body     = u'hello,this is a mail from ' + fromMail  
  
#初始化邮件  
encoding = 'utf-8'  
mail = MIMEText(body.encode(encoding),'plain',encoding)  
mail['Subject'] = Header(subject,encoding)  
mail['From'] = fromMail  
mail['To'] = toMail  
mail['Date'] = formatdate()  
  
try:  
    #连接smtp服务器，明文/SSL/TLS三种方式，根据你使用的SMTP支持情况选择一种  
    #普通方式，通信过程不加密  
    smtp = smtplib.SMTP(smtpHost,smtpPort)  
    smtp.ehlo()  
    smtp.login(username,password)  
  
    #tls加密方式，通信过程加密，邮件数据安全，使用正常的smtp端口  
    #smtp = smtplib.SMTP(smtpHost,smtpPort)  
    #smtp.set_debuglevel(True)  
    #smtp.ehlo()  
    #smtp.starttls()  
    #smtp.ehlo()  
    #smtp.login(username,password)  
  
    #纯粹的ssl加密方式，通信过程加密，邮件数据安全  
    #smtp = smtplib.SMTP_SSL(smtpHost,sslPort)  
    #smtp.ehlo()  
    #smtp.login(username,password)  
  
    #发送邮件  
    smtp.sendmail(fromMail,toMail,mail.as_string())  
    smtp.close()  
    print 'OK'  
except Exception as e:  
    print e