Python sends and receives emails

#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 = '×××' # Authorization code, not password

msg = MIMEText('Hello ','text','utf-8')#Chinese requires parameter 'utf-8', single-byte characters do not need
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()
------------If passwd is not an authorization code, the error will be reported as follows------------------

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 ')