how to change smtp port on another smtp mail server?

[yunpengb]

how to change smtp port on another smtp mail server? now i am using

yag = yagmail.SMTP( user="myid", password="myword", host='smtp.green.com')  
to = 'bbb@green.com'  
subject = 'test subject'  
body = 'test body'  
html = '<a href="https://pypi.python.org/pypi/sky/">Click me!</a>'  
img = '1.png'  
yag.send(to = to, subject = subject, contents = [body, html, img])

can not work now, i am thinking maybe i need define smtp port. error information is:

  yag.send(to = to, subject = subject, contents = [body, html, img])
File "C:\Python27\lib\site-packages\yagmail\sender.py", line 144, in send
  self.login()
File "C:\Python27\lib\site-packages\yagmail\sender.py", line 243, in login
  self._login(self.credentials)
File "C:\Python27\lib\site-packages\yagmail\sender.py", line 189, in _login
  self.smtp = self.connection(self.host, self.port, **self.kwargs)
File "C:\Python27\lib\smtplib.py", line 802, in __init__
  SMTP.__init__(self, host, port, local_hostname, timeout)
File "C:\Python27\lib\smtplib.py", line 256, in __init__
  (code, msg) = self.connect(host, port)
File "C:\Python27\lib\smtplib.py", line 317, in connect
  self.sock = self._get_socket(host, port, self.timeout)
File "C:\Python27\lib\smtplib.py", line 807, in _get_socket
  new_socket = socket.create_connection((host, port), timeout)
File "C:\Python27\lib\socket.py", line 575, in create_connection
  raise err
socket.error: [Errno 10060]

[yunpengb]

yag = yagmail.SMTP( user="myid", password="myword", host='smtp.green.com',port=25) got it