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Date: Sat, 05 Aug 2006 07:13:46 -0700
From: Chris Maness <chris@chrismaness.com>
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To: Matthew Seaman <m.seaman@infracaninophile.co.uk>
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Cc: freebsd-questions@freebsd.org
Subject: Re: DNS Blacklist Script?
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Matthew Seaman wrote:
> You need to be very careful implementing something like this.  Most
> Spam nowadays is bot-generated and uses forged 'From' addresses culled
> from the address books on infected machines.  Unless you're careful,
> you're going to end up blocking a lot of completely innocent people,
> or worse, blocking your own legitimate e-mail users.
>
>   
DNS based blacklists are based on the senders IP address, not the forged 
from address.