python版本：3

郵箱：QQ郵箱，埠465

　　使用python的smtp模組進行郵件傳送，自己測試能成功，但是生產環境會報錯：smtplib.SMTPServerDisconnected: Connection unexpectedly closed

指令碼如下：

import smtplib
from email.mime.text import MIMEText

mailserver = "smtp.qq.com"
username_send = '[email protected]'
password = 'frptpssewdsibggc'
username_recv = '[email protected]'
mail = MIMEText('成功！')
mail['Subject'] = 'Python測試'
mail['From'] = username_send
mail['To'] = username_recv
smtp = smtplib.SMTP(mailserver,port=465)
smtp.login(username_send,password)
smtp.sendmail(username_send,username_recv,mail.as_string())
smtp.quit()
print ('success')

報錯：

C:\Users\HU\Desktop>python test.py
Traceback (most recent call last):
  File "test.py", line 12, in <module>
    smtp = smtplib.SMTP(mailserver,port=465)
  File "C:\Users\HU\AppData\Local\Programs\Python\Python38\lib\smtplib.py", line 253, in __init__
    (code, msg) = self.connect(host, port)
  File "C:\Users\HU\AppData\Local\Programs\Python\Python38\lib\smtplib.py", line 341, in connect
    (code, msg) = self.getreply()
  File "C:\Users\HU\AppData\Local\Programs\Python\Python38\lib\smtplib.py", line 398, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
smtplib.SMTPServerDisconnected: Connection unexpectedly closed
 

　　把通過smtp的server地址，埠連線換成通過smtp_ssl連線，即將smtp = smtplib.SMTP(mailserver,port=465)改成smtp = smtplib.SMTP_SSL(mailserver)連線（其中mailserver= ‘smtp.qq.com’），即可成功。