Traceback (most recent call last): File "D:/pythoncode/liaoxuefeng3/stmpsend.py", line 11, in <module> server = smtplib.SMTP(smtpserver, 25) File "C:\Python3\lib\smtplib.py", line 251, in _init (code, msg) = self.connect(host, port) File "C:\Python3\lib\smtplib.py", line 335, in connect self.sock = self._get_socket(host, port, self.timeout) File "C:\Python3\lib\smtplib.py", line 306, in _get_socket self.source_address) File "C:\Python3\lib\socket.py", line 693, in create_connection for res in getaddrinfo(host, port, 0, SOCK_STREAM): File "C:\Python3\lib\socket.py", line 732, in getaddrinfo for res in _socket.getaddrinfo(host, port, family, type, proto, flags): socket.gaierror: [Errno 11004] getaddrinfo failed