Ola William,
aqui vai as regras referente ao servidor SMTP.

iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 25 -j DNAT 
--to-destination 10.151.1.101

iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE



particularmente crio eu q nao seja referente a regras de firewall e sim 
a configuracoes no qmail....
segue abaixo uma copia do codigo fonte de um email recebido pelo dominio 
q desejo configurar!

(por motivos de segurancao mascarei o meu dominio para <dominio.com.br> 
e meu ip de internet para <200.x.x.x>


 From - Tue Feb 13 15:23:15 2007
X-UIDL: 1171387388.17238.darkstar,S=1877
X-Mozilla-Status: 0001
X-Mozilla-Status2: 00000000
Return-Path: <[EMAIL PROTECTED]>
Delivered-To: [EMAIL PROTECTED]
Received: (qmail 17236 invoked by uid 1038); 13 Feb 2007 15:23:08 -0200
Received: from [EMAIL PROTECTED] by darkstar by uid 1046 with 
qmail-scanner-1.22-st-qms
  ( Clear:RC:0(200.x.x.x):.
  Processed in 2.219573 secs); 13 Feb 2007 17:23:08 -0000
X-Antivirus-MYDOMAIN-Mail-From: [EMAIL PROTECTED] via darkstar
X-Antivirus-MYDOMAIN: 1.22-st-qms (Clear:RC:0(200.x.x.x):. Processed in 
2.219573 secs Process 17225)
Received: from 200-x-x-x.gnace300.ipd.brasiltelecom.net.br (HELO 
dominio.com.br) (200.x.x.x)
   by darkstar.domain.com with SMTP; 13 Feb 2007 15:23:06 -0200
Received: (qmail 26719 invoked by uid 1010); 13 Feb 2007 15:22:14 -0200
Received: from 10.151.1.101 by mail (envelope-from 
<[EMAIL PROTECTED]>, uid 1007) with qmail-scanner-1.25-st-qms
  (clamdscan: 0.87/2527. spamassassin: 2.63. perlscan: 1.25-st-qms.
  Clear:RC:0(10.151.1.101):SA:0(-2.6/5.0):.
  Processed in 1.888218 secs); 13 Feb 2007 17:22:14 -0000
X-Spam-Status: No, hits=-2.6 required=5.0
X-Antivirus-MYDOMAIN-Mail-From: [EMAIL PROTECTED] via mail
X-Antivirus-MYDOMAIN: 1.25-st-qms 
(Clear:RC:0(10.151.1.101):SA:0(-2.6/5.0):. Processed in 1.888218 secs 
Process 26711)
Received: from unknown (HELO localhost) 
([EMAIL PROTECTED]@10.151.1.101)
   by dominio.com.br with SMTP; 13 Feb 2007 15:22:12 -0200
MIME-Version: 1.0
Date: Tue, 13 Feb 2007 15:22:11 -0200
From:  <[EMAIL PROTECTED]>
To: bacteria_ <[EMAIL PROTECTED]>
Subject: eae
Message-ID: <[EMAIL PROTECTED]>
X-Sender: [EMAIL PROTECTED]
User-Agent: RoundCube Webmail/0.1b
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8bit

eae




William Lima wrote:
> Caro,
> 
> Como esta suas regras de firewall? Coloque aqui para analisarmos.
> 
> Abraços,

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