How to bind simple smtp python server to lan?

Question

I need a python smtp server to receive multiple dvr alarm mail,store it and process. I looked around and found this simple code:

   from datetime import datetime
   import asyncore
   from smtpd import SMTPServer

   class EmlServer(SMTPServer):
       no = 0
       def process_message(self,peer, mailfrom, rcpttos, data, **kwargs):
           adesso=datetime.now().strftime('%Y%m%d%H%M%S')
           print(adesso)
           print(data)
           return
           filename=alarm.eml
           with open(filename, 'w') as f:
                f.write(data)
           self.no += 1
           return None

    def run():
        foo = EmlServer(('0.0.0.0', 1025), None,decode_data=True)
        print(repr(foo))
        try:
            asyncore.loop()
        except KeyboardInterrupt:
            pass
        except Exception as e:
            print(repr(e))


    if __name__ == '__main__':
        run()

from the same machine it is ok, mail are received and read , from other pc in same LAN I cannot connect. What's wrong? Thanks all.