Hi there

I have a Postfix installation (postfix-2.6.5-1.rhel5) and I relay a couple of remote ip addresses
(static adsl) of remote sites.

I cannot figure out how a spam originator fired some e-mails through my mail server
using a specific remote IP, which was relayed

Return-Path: <oqoxl...@hirewebdevelopersindia.com>
Received: from hhyllw (smtp.domain.tld[111.222.333.444])
   by smtp.thessaloniki.gr (Postfix) with ESMTP id 8DB72180C1
   for <jroc...@domain1.tld>; Mon,  1 Feb 2010 08:49:00 +0200 (EET)
Received: from beoeb ([xxx.yyy.zzz.ccc])
   by EADYCSRY (8.13.4/8.13.4) with SMTP id u4231584378453i6Ib016100
   for <jroc...@domain1.tld>; Mon, 01 Feb 2010 08:48:56 +0200 (CDT)

The 111.222.333.444 is the relayed trusted ip and xxx.yyy.zzz.ccc is the malicious one.


How can I prevent such things?????


Thanks in advane
Dimitrios


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