Re: OSF for an ISP (was Re: ..idea; ddos spam hosts off Internet?)
----- Original Message -----
From: "Russell Coker" <russell@coker.com.au>
To: <debian-isp@lists.debian.org>
Cc: "Pulu 'Anau" <pulu@afe.to>
Sent: Saturday, April 10, 2004 3:12 PM
Subject: Re: OSF for an ISP (was Re: ..idea; ddos spam hosts off Internet?)
> For NT (XP etc) you could allow every fourth day for receiving mail. Mail is
> generally queued for four days before being bounced, so if you only accept
> mail from NT machines every fourth day then you lose 75% of the spam and
> viruses because spam proxies and viruses generally don't re-try. Legit mail
> servers will keep trying until you let them through.
>
> Avoiding 75% of the spam and viruses isn't a solution to the problem, but it's
> a good start...
>
Have a look at http://www.greylisting.org/ and you could avoid much more spam
while reducing false positives to nearly zero!
Christian
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