[184543] in North American Network Operators' Group
Re: How to wish you hadn't forced ipv6 adoption (was "How to force
daemon@ATHENA.MIT.EDU (John Levine)
Wed Oct 7 14:59:36 2015
X-Original-To: nanog@nanog.org
Date: 7 Oct 2015 18:59:10 -0000
From: "John Levine" <johnl@iecc.com>
To: nanog@nanog.org
In-Reply-To: <20151006181655.GC20816@besserwisser.org>
Errors-To: nanog-bounces@nanog.org
>Using the link-level address to distinguish between good and bad email
>content was always daunting at best. Thanks for pointing out that this
>flawed behaviour must cease.
I don't know anyone who does that. But I know a lot of people who use
both IPv4 and IPv6 addresses to distinguish among "has sent legit
mail", "is a spambot", and "no history". Those are handy when mixed
into the usual multi-factor spam filtering. Outright blocking on
conservative lists of spambots like the CBL (now XBL) works well, too.
R's,
John
