[plug] spam mail

[Jon Miller]

In looking at spam mail headers and seeing that my system reports
(unknown [208.158.84.104]  Can I tell the Postfix system that if an
unknown tries to communicate do not accept the message or redirect the
mail? 

ex:1
Received: from 208.158.84.104 (unknown [208.158.84.104]) by
gateway.mmtnetworks.com.au (Postfix) with SMTP id 2308010 for
<jlmiller at mmtnetworks.com.au>; Tue, 25 Feb 2003 03:18:21 +0800 (WST)

Ex:2
Received: from gateway.mmtnetworks.com.au ([192.168.1.3]) by
mmtnetworks.com.au; Tue, 25 Feb 2003 02:46:07 +0800
Received: from gateway (localhost.localdomain [127.0.0.1]) by localhost
(Postfix) with ESMTP id 7FB26F for <jlmiller at mmtnetworks.com.au>; Tue,
25 Feb 2003 03:00:56 +0800 (WST)
Received: from localhost.localdomain ([127.0.0.1]) by
gateway.mmtnetworks.com.au (MailMonitor for SMTP v1.2.0 ) ; Tue, 25 Feb
2003 03:00:56 +0800 (WST)
Received: from 61.175.235.141 (unknown [61.175.235.141]) by
gateway.mmtnetworks.com.au (Postfix) with SMTP id A3B01F for
<jlmiller at mmtnetworks.com.au>; Tue, 25 Feb 2003 03:00:41 +0800 (WST)
Received: from unknown (HELO smtp4.cyberec.com) (24.156.151.193) by
rly-xw05.mx.aol.com with esmtp; Feb, 24 2003 9:20:38 AM -0800
Received: from 14.17.76.127 ([14.17.76.127]) by rly-xl04.mx.aol.com with
QMQP; Feb, 24 2003 8:13:20 AM +0700

-- 
Jon Miller <jlmiller at mmtnetworks.com.au>
MMT Networks Pty Ltd