text: #!/usr/bin/python
  
  import socket
  import sys
  if len(sys.argv) != 2:         
  	print "Usage: vrfy.py <username>"         
  	sys.exit(0)
  
  # Create a Socket 
  s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
  
  # Connect to the Server
  connect=s.connect(('10.11.1.215',25))
  
  # Receive the banner
  banner=s.recv(1024)
  print banner 
  # VRFY a user
  s.send('VRFY ' + sys.argv[1] + '\r\n')
  result=s.recv(1024)
  print result 
  # Close the socket 
  s.close()