如果消息头，有效负载包含非ASCII字符，则应对其进行编码：
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from email.header import Header
from email.mime.text import MIMEText
from getpass import getpass
from smtplib import SMTP_SSL
login, password = 'user@gmail.com', getpass('Gmail password:')
recipients = [login]
# create message
msg = MIMEText('message body…', 'plain', 'utf-8')
msg['Subject'] = Header('subject…', 'utf-8')
msg['From'] = login
msg['To'] = ", ".join(recipients)
# send it via gmail
s = SMTP_SSL('smtp.gmail.com', 465, timeout=10)
s.set_debuglevel(1)
try:
s.login(login, password)
s.sendmail(msg['From'], recipients, msg.as_string())
finally:
s.quit()
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