At 02:29 PM 4/21/2004 -0400, you wrote:
From: Meng Weng Wong <mengwong(_at_)dumbo(_dot_)pobox(_dot_)com>
Subject: related to "mxout": a 3-step antispam rule that stops zombie spam
Date: Wed, 21 Apr 2004 00:20:16 -0400
This is an interesting alternative approach to the MTAMark space.
I would like to mention that our single most successful antispam rule at
Pobox is "does it look like a broadband host". We can tell if a machine
is a broadband host simply by checking if the hostname contains the IP
address. Broadband machines usually PTR to something like
6535215hfc174.tampabay.rr.com
c-24-8-173-129.client.comcast.net
********************** REPLY SEPARATER **************************
It is wrong to assume that broadband lines are home users. We service our
customers using 2 X 4 Mbps ADSL circuits operating in a balanced mode. It
is 1/4 the cost of T1/T3 and just as reliable.
J.A. Coutts