[SURBL-Discuss] Why are subdomains not blacklisted?

Rob McEwen (PowerView Systems) rob at powerviewsystems.com
Fri Nov 24 00:40:35 CET 2006


There is a long (2-3 paragraph) answer for the general question "Why are subdomains not blacklisted?", but the short answer is that it is the responsibility of the program or spam filter making use of SURBL to remove the extra levels and check "kennevur.com" against SURBL instead of "uztiuqhcsgdnhsx.kennevur.com"

In this situation, a good filter will not bother checking the longer version but would know to extract just the domain name for checking.

Rob McEwen
PowerView Systems
rob at PowerViewSystems.com
(478) 475-9032

-----Original message-----
From: "Kelly Jones" kelly.terry.jones at gmail.com
Date: Thu, 23 Nov 2006 17:43:09 -0500
To: discuss at lists.surbl.org
Subject: [SURBL-Discuss] Why are subdomains not blacklisted?

> I received two separate spams advertising
> "uztiuqhcsgdnhsx.kennevur.com" and "678.com.plaweresoft.com" as the
> domains.
> multi.surbl.org lists the domains as blacklisted:
> > host kennevur.com.multi.surbl.org
> kennevur.com.multi.surbl.org has address
> > host plaweresoft.com.multi.surbl.org
> plaweresoft.com.multi.surbl.org has address
> but not the subdomains:
> > host uztiuqhcsgdnhsx.kennevur.com.multi.surbl.org
> Host uztiuqhcsgdnhsx.kennevur.com.multi.surbl.org not found: 3(NXDOMAIN)
> > host 678.com.plaweresoft.com.multi.surbl.org
> Host 678.com.plaweresoft.com.multi.surbl.org not found: 3(NXDOMAIN)
> Why? Wouldn't it be easy/sensible to wildcard the blacklist to include
> these?
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> Discuss at lists.surbl.org
> http://lists.surbl.org/mailman/listinfo/discuss

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