python收发邮件

#coding: utf-8  
import smtplib  
from email.mime.text import mimetext  
from email.header import header  
  
sender = '×××@163.com'  
receiver = '×××@qq.com'  
subject = 'python email test2'  
smtpserver = 'smtp.163.com'  
username = '×××'  
password = '×××'  # 授权码，不是密码 
  
msg = mimetext('你好','text','utf-8')#中文需参数‘utf-8’，单字节字符不需要  
msg['subject'] = header(subject, 'utf-8')  
msg["to"]=receiver 
smtp = smtplib.smtp()  
smtp.connect('smtp.163.com')  
smtp.login(username, password)  
smtp.sendmail(sender, receiver, msg.as_string())  
smtp.quit() 
------------如果passwd不是授权码的话，报错如下------------------- 

jack@jack-desktop:~/work/script/test$ python testemai.py 
traceback (most recent call last): 
  file "testemai.py", line 19, in  
    smtp.login(username, password)  
  file "/home/jack/anaconda/lib/python2.7/smtplib.py", line 622, in login 
    raise smtpauthenticationerror(code, resp) 
smtplib.smtpauthenticationerror: (535, 'error: authentication failed') 
jack@jack-desktop:~/work/script/test$ python testemai.py 
traceback (most recent call last): 
  file "testemai.py", line 19, in  
    smtp.login(username, password)  
  file "/home/jack/anaconda/lib/python2.7/smtplib.py", line 622, in login 
    raise smtpauthenticationerror(code, resp) 
smtplib.smtpauthenticationerror: (535, 'error: authentication failed')