TimeoutError：使用smtplib时，Windows Server中出现[WinError 10060]

问题描述

我正在尝试使用smtplib模块发送邮件。我可以使用Windows-7 PC成功发送电子邮件，但是在Windows Server 2008 R2 Enterprise 64-bit(6.1,Build 7601)中尝试相同的代码时却收到了TimeoutError: [WinError 10060]。

下面附有代码。

def send_email(from_addr,to_addr_list,subject,html_body,plain_text_body,login,password,smtpserver='smtp.gmail.com:587',cc_addr_list=None,attachment=None,from_name=None):

    message=MIMEMultipart()

    plain=MIMEText(plain_text_body,'plain')
    #html=MIMEText(html_body,'html') 

    message.add_header('from',from_name)
    message.add_header('to',','.join(to_addr_list))
    message.add_header('subject',subject)

    if attachment!=None:
        attach_file=MIMEApplication(open(attachment,"rb").read())
        attach_file.add_header('Content-disposition','attachment; filename="%s"' % attachment)
        message.attach(attach_file)


    message.attach(plain)
    #message.attach(html)

    server = smtplib.SMTP(smtpserver) #TimeoutError raised on this line 
    server.starttls()
    server.login(login,password)
    server.sendmail(from_addr,message.as_string())
    server.quit()
    print("MailSent")

我在下面的行中出现错误

server = smtplib.SMTP(smtpserver)

下面附有错误消息

"C:\Users\Administrator\AppData\Local\Programs\Python\python37\lib\smtplib.py",line 251,in __init__
    (code,msg) = self.connect(host,port)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\python37\lib\smtplib.py",line 336,in connect
    self.sock = self._get_socket(host,port,self.timeout)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\python37\lib\smtplib.py",line 307,in _get_socket
    self.source_address)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\python37\lib\socket.py",line 728,in create_connection
    raise err
  File "C:\Users\Administrator\AppData\Local\Programs\Python\python37\lib\socket.py",line 716,in create_connection
    sock.connect(sa)
TimeoutError: [WinError 10060] A connection attempt Failed because the connected party did not properly respond after a period of time,or established connection Failed because connected host has Failed to respond

我尝试了以下所有选项，我得到的是相同的TimeoutError: [WinError 10060];

我已在Gmail帐户中启用了“允许安全程度较低的应用程序”选项。
Server = smtplib.SMTP_SSL("smtp.gmail.com",465)
Server = smtplib.SMTP ("smtp.gmail.com",587)
Server = smtplib.SMTP ("smtp.gmail.com",587,timeout=120)
Server = smtplib.SMTP ("smtp.gmail.com:587”)
我在防火墙的入站和出站规则中允许端口587和465。
我还尝试了yagmail模块（出现相同错误）

我错过了什么吗？或任何其他值得赞赏的解决方案。

解决方法

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