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Date: Tue, 13 Jun 2006 12:45:57 +0200
From: Matthias Andree <matthias.andree@gmx.de>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Horst von Brand <vonbrand@inf.utfsm.cl>, jdow <jdow@earthlink.net>,
       Jesper Juhl <jesper.juhl@gmail.com>, nick@linicks.net,
       Bernd Petrovitsch <bernd@firmix.at>, marty fouts <mf.danger@gmail.com>,
       Matti Aarnio <matti.aarnio@zmailer.org>, linux-kernel@vger.kernel.org
Subject: Re: VGER does gradual SPF activation (FAQ matter)
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References: <200606130300.k5D302rc004233@laptop11.inf.utfsm.cl> <1150189506.11159.93.camel@shinybook.infradead.org>
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On Tue, 13 Jun 2006, David Woodhouse wrote:

> On Mon, 2006-06-12 at 23:00 -0400, Horst von Brand wrote:
> > > Greylist those who have not subscribed.
> > 
> > That is not easy to do. 
> 
> It's fairly trivial with a decent MTA. I use all kinds of conditions to
> trigger greylisting -- HTML mail, 'Re:' in subject with no References:,
> lack of reverse DNS or CSA on the sending host, >=0.1 SA points, etc.
> Adding "is not subscribed to the mailing list they're trying to post to"
> should be trivial.

Given that list drivers are separate from the MTA (and that's good),
it's less trivial than simple looking at message headers or DNS info
that the MTA shuffles around anyways. The MTA doesn't need the
subscription list however, since "exploding" the subscriber list is a
separate problem handled by Majordomo, Mailman, Sympa, whatever.

-- 
Matthias Andree