In addition to what Karsten wrote about debian:

Michelle Konzack schrieb:

> Received: from localhost (server7.pinguin-hosting.de [127.0.0.1])
>         by server7.pinguin-hosting.de (Postfix) with SMTP id D1EFC613E6
>         for <[email protected]>; Thu, 26 Feb 2009 
> 22:19:21 +0100 (CET)
> Received: from master.debian.org (master.debian.org [70.103.162.29])
>         by server7.pinguin-hosting.de (Postfix) with ESMTP id 913EF59FF2
>         for <[email protected]>; Thu, 26 Feb 2009 
> 22:19:21 +0100 (CET)
> Received: from qa by master.debian.org with local (Exim 4.63)
>         (envelope-from 
> <bounces+20090226-xxxxxxxxxx.bts4michelle=tamay+2ddogan....@packages.qa.debian.org>)
>         id 1LcndY-00026z-C0
>         for [email protected]; Thu, 26 Feb 2009 21:19:20 
> +0000
> Received: from powell.debian.org ([87.106.64.223])      by master.debian.org
>  with esmtp (Exim 4.63)         (envelope-from <[email protected]>)    id
>  1LcndX-00026J-89       for [email protected]; Thu,
>  26 Feb 2009 21:19:19 +0000
> Received: from host77-252-dynamic.35-79-r.retail.telecomitalia.it
>  ([79.35.252.77] helo=xmbxcws.telecomitalia.it)         by powell.debian.org 
> with
>  smtp (Exim 4.69)       (envelope-from <[email protected]>)    id
>  1LcndT-0005qV-Ff       for [email protected]; Thu, 26 Feb 2009 
> 21:19:17
>  +0000

The chain is most likely Spammer > v...@packages... > Debian-internal
forwarding > your mailserver.

You should add the debian mailservers to your trust path
(trusted_networks/internal_networks depending on circumstances) so that
RBL checks are applied to the correct IP addresses.

Speaking of which, it may actually make sense to use all of dnswl.org's
entries as trusted_networks-entries...

-- Matthias

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