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 <module>
    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 <module>
    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')