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Re: Advanced tricks I use to get rid of spam using MX 4xx

from [Charles Cazabon] [Permanent Link][Original]
To: qmail@list.cr.yp.to
Subject: Re: Advanced tricks I use to get rid of spam using MX 4xx
From: Charles Cazabon <qmail@discworld.dyndns.org>
Date: Mon, 27 Nov 2006 19:37:30 -0600
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Paul Jarc <prj@po.cwru.edu> wrote:
> Harald Hanche-Olsen <hanche@math.ntnu.no> wrote:
> > Are there Unix variants that will let you decide in userland what to
> > do about an incoming SYN?
> 
> It could be done by manipulating firewall rules, although that's
> hardly convenient.

Don't the BSD and Linux networking stacks let you do this with the netfilter
stuff?  I'm sure they let you pass packets to a userspace application for
accept/reject/drop or more complex processing.

Charles
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Charles Cazabon                               <qmail@discworld.dyndns.org>
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