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How to filter reverse dns with "dsl"?

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=5571
Printed Date: 09 May 2025 at 1:08pm


Topic: How to filter reverse dns with "dsl"?
Posted By: Stupid
Subject: How to filter reverse dns with "dsl"?
Date Posted: 07 April 2006 at 5:36pm

A lot of spam come from a reverse domain name that has "dsl" or "cable" associated in rDNS lookup.

Is there a way to filter those IP addresses?


Replies:
Posted By: LogSat
Date Posted: 09 April 2006 at 11:31am
There is no way to search within rDNS text, but please note that some MAPS RBL servers do blacklist dynamic IP addresses, as many of the "dsl" and "cable" are. I think that SORBS is one of them, but am not 100% certain...

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Roberto Franceschetti

http://www.logsat.com" rel="nofollow - LogSat Software

http://www.logsat.com/sfi-spam-filter.asp" rel="nofollow - Spam Filter ISP

Posted By: Desperado
Date Posted: 10 April 2006 at 12:50pm
combined.njabl.org is one that lists DHCP (Dynamic) IP's.  I actually stopped using SORBS as they started using extortion if you wanted to get de-listed.  As a result, no one de-lists and a lot of false positives started showing up.  Hence, I removed it after getting hammered by support calls from our customers.

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The Desperado
Dan Seligmann.
Work: http://www.mags.net
Personal: http://www.desperado.com


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