python – socket.gaierror：[Errno 11001] getaddrinfo失败

import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEText import MIMEText
from smtplib import SMTPException


def send_Email():
    file1="abc.txt"
    message = "Test mail"
    msg = MIMEMultipart()

    msg.attach(MIMEText(file(file1).read()))

    try:
        smtpObj = smtplib.SMTP('smtp server name',port)
        smtpObj.sendmail(sender,EmailId,message,msg.as_string() )
        print "Successfully sent email"
    except SMTPException:
        print "Error: unable to send email"

Bt我收到错误：socket.gaierror：[Errno 11001] getaddrinfo失败

完整的错误消息：

File "C:Python27libsmtplib.py",line 249,in __init__
    (code,msg) = self.connect(host,port)
  File "C:Python27libsmtplib.py",line 309,in connect
    self.sock = self._get_socket(host,port,self.timeout)
  File "C:Python27libsmtplib.py",line 284,in _get_socket
    return socket.create_connection((port,host),timeout)
  File "C:Python27libsocket.py",line 553,in create_connection
    for res in getaddrinfo(host,SOCK_STREAM):
socket.gaierror: [Errno 11001] getaddrinfo failed