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How to block this?

From: LinuxCorporate [ Postfix ] (lista.postfixmg.trt.gov.br)
Date: Tue Apr 01 2008 - 08:20:53 CDT


Hi guys,

My postfix has been configured to not accept mail from anyonemydomain.com
if it was not
generated inside my network and it has been working gladly.

But I've got some massages that apear to pass through this configuration,
whose example
follows below: See the lines enclosed by [ ]. The first one shows that it's
an IP outside my
network and the second one forges an address of my domain "Ana
Carla"mg.trt.gov.br.

Does anyone know how can I block this?

Thanks.

Return-Path: <annebeatriz2008gmail.com>
X-Original-To: paulobs
Received: from localhost (gandalf.trt.gov.br [127.0.0.1])
        by gandalf.trt.gov.br (Postfix) with SMTP id 358662B2B13
        for <paulobs>; Wed, 26 Mar 2008 13:53:37 -0300 (BRT)
[ Received: from ROADCOM (unknown [189.81.75.243]) ]
        by gandalf.trt.gov.br (Postfix) with SMTP id 70DD72B2A87
        for <paulobsmg.trt.gov.br>; Wed, 26 Mar 2008 13:53:13 -0300 (BRT)
[ From: "" <"Ana Carla"mg.trt.gov.br> ]
To: "paulobs" <paulobsmg.trt.gov.br>
Subject: Oiiee tudo bem???
Date: Wed, 26 Mar 08 13:47:01 Hora oficial do Brasil
MIME-Version: 1.0
Content-Type: multipart/mixed;boundary=
"----=_NextPart_000_00CC_22A781C8.2DA5EE29"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2462.0000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2462.0000
Message-Id: <20080326165313.70DD72B2A87gandalf.trt.gov.br>