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：
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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