从 python 脚本发送电子邮件

Question

I am working on writing a python test using unittest and selenium webdriver to test if our server is down, and to send an email to notify me if it is not. I am currently working on implementing just the email functionality. This is my current code. When run, the program seems to run, but never ends, and never sends the email. (ie in the command line the program seems as though it is running as it doesn't give any errors and you have to escape the "running" program before you can enter another command). My current code is:

 #tests for if server is up and notifies if it is not
    import unittest
    from selenium import webdriver
    from selenium.webdriver.common.keys import Keys
    import os
    import time
    from selenium.webdriver.firefox.firefox_binary import FirefoxBinary
    from selenium.webdriver.common.action_chains import ActionChains
    from urllib.request import urlopen
    from html.parser import HTMLParser
    import smtplib
    
    
    class PythonOrgSearch(unittest.TestCase):
    
            server = smtplib.SMTP('smtp.gmail.com', 587)
            server.login("email@gmail.com", "password")
            msg = "Testing if server is down" 
            server.sendmail("email@gmail.com", "email@gmail.com", msg)
    
    if __name__ == "__main__":
        unittest.main()

I am unsure why this does not work, and would appreciate any insight. Thank you!

Edit

When changing the code as suggested, I got the following error:

Traceback (most recent call last):
  File "testServerIsUp.py", line 14, in <module>
    class PythonOrgSearch(unittest.TestCase):
  File "testServerIsUp.py", line 18, in PythonOrgSearch
    server.starttls() #and this method to begin encryption of messages
  File "C:\Users\663255\AppData\Local\Programs\Python\Python36\lib\smtplib.py", line 751, in starttls
    "STARTTLS extension not supported by server.")
smtplib.SMTPNotSupportedError: STARTTLS extension not supported by server.

Answer 1

You need to start a conversation with the mail server and enable encryption:

server = smtplib.SMTP('smtp.gmail.com', 587)
server.ehlo()
server.starttls() #and this method to begin encryption of messages
server.login("email@gmail.com", "password")
msg = "Testing if server is down" 
server.sendmail("email@gmail.com", "email@gmail.com", msg)

Since the smtplib.SMTP() call was not successful, you can try SMTP_SSL on port 465:

server = smtplib.SMTP_SSL('smtp.gmail.com', 465)
server.login("email@gmail.com", "password")
msg = "Testing if server is down" 
server.sendmail("email@gmail.com", "email@gmail.com", msg)