Hi,

 What I would like is that my tcpserver and/or smtpd look up the remote host  
IP address 
using reverse DNS and compare it to the hostname. If they do not match, denies 
the 
connection.
 it would be option "-p" of tcpserver, but I would like to apply this 
functionality for 
range of IP.
 Is there anybody who could help me ?


                                               Thanks a lot guys


David Magno Santos de Almeida
Suporte Técnico
InfoNet - Soluções Internet
(0xx79) 2106-8000/  (0xx79) 9978-7925 
[EMAIL PROTECTED]

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