Python 用smtplib库发邮件报错：[WinError 10061] 由于目标计算机积极拒绝，无法连接。解决办法

看了菜鸟的教程，有这段代码：

​​mail = smtplib.SMTP("localhost")​​

然后就报错了。菜鸟的教程太老了，Python迭代这么快，根本跟不上。

​把这个里面的参数去掉就好了。​

​​mail = smtplib.SMTP()​​

​可以看我的这篇文章，简单易懂：​

​​Python 技术篇-用qq账号发送邮箱​​

​报错代码：​

Traceback (most recent call last):
  File "test.py", line 10, in <module>
    mail = smtplib.SMTP("localhost")
  File "D:\Python\lib\smtplib.py", line 251, in __init__
    (code, msg) = self.connect(host, port)
  File "D:\Python\lib\smtplib.py", line 336, in connect
    self.sock = self._get_socket(host, port, self.timeout)
  File "D:\Python\lib\smtplib.py", line 307, in _get_socket
    self.source_address)
  File "D:\Python\lib\socket.py", line 724, in create_connection
    raise err
  File "D:\Python\lib\socket.py", line 713, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [WinError 10061] 由于目标计算机积极拒绝，无法连接。

​报错截图：​

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