[100369] in North American Network Operators' Group
Re: Misguided SPAM Filtering techniques
daemon@ATHENA.MIT.EDU (Al Iverson)
Mon Oct 22 13:11:58 2007
Date: Mon, 22 Oct 2007 11:30:27 -0500
From: "Al Iverson" <aiversonlists@spamresource.com>
To: "nanog list" <nanog@nanog.org>
In-Reply-To: <471CC4A9.2020005@labrats.us>
Errors-To: owner-nanog@merit.edu
On 10/22/07, Sean Figgins <sean@labrats.us> wrote:
>
> Dave Pooser wrote:
>
> > Whenever I get one of those, I go ahead and confirm the message so the spam
> > gets through to the end user. I figure if they think I'm gonna filter their
> > mail for free, well, they get what they pay for. :^)
>
> And that is probably just fine, as 99% of the true spam comes from email
> addresses (and often doamins) that either do not exist, or often are not
> configured to receive email.
Cite?
I log only valid domains used as the PRA or MFROM in the spam I
receive, about 10k/day. Counting valid domains only, each domain is
only seen on about three different spams, when averaged out. That's a
hell of a lot of domains that actually exist, and I think a more
accurate assumption is that a significant nonzero amount of that
backscatter does actually reach a recipient mailbox on the other end.
Regards,
Al Iverson
--
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