From: Kurt Lieber <klieber@gentoo.org>
To: gentoo-dev@lists.gentoo.org
Subject: Re: [gentoo-dev] Monthly Gentoo Council Reminder for November
Date: Wed, 8 Nov 2006 20:01:52 +0000 [thread overview]
Message-ID: <20061108200152.GA4007@mail.lieber.org> (raw)
In-Reply-To: <20061108175413.7a76fd3c@snowdrop.home>
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On Wed, Nov 08, 2006 at 05:54:13PM +0000 or thereabouts, Ciaran McCreesh wrote:
> We've identified one very widely used application that interprets SPF
> records based upon how they're used by spammers rather than by how the
> specification says they should be interpreted. In this case, SA is
> entirely reasonable in its behaviour -- SPF makes the classic incorrect
> assumption that spammers won't abuse the system.
Ciaran, you obviously do not understand the issue, nor do you know what
you're talking about.
The issue is that SpamAssassin assigns a score of ~1 to any email that
FAILS an SPF check for a domain that has a ?all (neutral) rating. I want
to stress that it has to FAIL. If it doesn't fail, I believe SA's default
behavior is to assign a *negative* score of 0.1.
So, in other words, spammers aren't abusing anything related to SPF.
They're sending mail using forged return-paths and SPF is highlighting
that. Which is exactly what SPF is designed to do.
The impact is that some users happen to send mail in a way that ends up
looking very similar to a spammer sending an email with a forged
return-path. And, because of the way SA has chosen to interpret this,
those valid, non-spam emails get assigned a positive spam value, even when
the mail administrator has asked them not to.
--kurt
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next prev parent reply other threads:[~2006-11-08 20:05 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-01 8:40 [gentoo-dev] Monthly Gentoo Council Reminder for November Mike Frysinger
2006-11-05 9:35 ` Peter Gordon
2006-11-05 9:57 ` Mike Frysinger
2006-11-05 17:12 ` Peter Gordon
2006-11-05 9:59 ` Ciaran McCreesh
2006-11-05 10:17 ` Paul de Vrieze
2006-11-05 10:23 ` David Shakaryan
2006-11-05 10:59 ` Marius Mauch
2006-11-06 19:33 ` Chris Gianelloni
2006-11-06 0:06 ` Ryan Tandy
2006-11-06 0:42 ` Josh Saddler
2006-11-06 19:30 ` Chris Gianelloni
2006-11-05 9:50 ` Alin Nastac
2006-11-05 10:30 ` Mike Frysinger
2006-11-05 10:39 ` Alin Nastac
2006-11-05 10:45 ` Mike Frysinger
2006-11-05 11:12 ` Alin Nastac
2006-11-05 12:36 ` Jakub Moc
2006-11-05 11:59 ` Mike Frysinger
2006-11-05 15:00 ` Alin Nastac
2006-11-05 21:41 ` Mike Frysinger
2006-11-06 7:12 ` Alin Nastac
2006-11-06 19:37 ` Chris Gianelloni
2006-11-06 19:54 ` Ciaran McCreesh
2006-11-06 20:14 ` Seemant Kulleen
2006-11-06 20:35 ` Seemant Kulleen
2006-11-06 22:19 ` Diego 'Flameeyes' Pettenò
2006-11-06 21:14 ` Danny van Dyk
2006-11-06 21:59 ` Jakub Moc
2006-11-06 21:43 ` Mike Frysinger
2006-11-06 22:09 ` Alin Nastac
2006-11-06 22:20 ` Mike Frysinger
2006-11-06 22:34 ` Wernfried Haas
2006-11-06 22:38 ` Harald van Dijk
2006-11-06 22:48 ` Mike Frysinger
2006-11-07 6:55 ` Lance Albertson
2006-11-07 7:24 ` Georgi Georgiev
2006-11-07 8:57 ` Tobias Klausmann
2006-11-08 17:29 ` Kurt Lieber
2006-11-08 17:38 ` Seemant Kulleen
2006-11-08 17:54 ` Ciaran McCreesh
2006-11-08 19:19 ` Roy Marples
2006-11-08 19:57 ` Ciaran McCreesh
2006-11-08 20:01 ` Kurt Lieber [this message]
2006-11-08 20:13 ` Ciaran McCreesh
2006-11-08 20:14 ` Diego 'Flameeyes' Pettenò
2006-11-08 20:55 ` Kurt Lieber
2006-11-08 21:17 ` Alin Nastac
2006-11-08 21:30 ` Diego 'Flameeyes' Pettenò
2006-11-08 22:06 ` Alin Nastac
2006-11-08 22:44 ` Francesco Riosa
2006-11-08 23:28 ` Alec Warner
2006-11-08 21:39 ` Tobias Klausmann
2006-11-09 15:11 ` Elfyn McBratney
2006-11-07 15:37 ` Aron Griffis
2006-11-07 16:00 ` Grant Goodyear
2006-11-07 16:09 ` Ciaran McCreesh
2006-11-07 16:52 ` Alin Nastac
2006-11-07 17:47 ` Ciaran McCreesh
2006-11-07 20:34 ` Wernfried Haas
2006-11-07 20:51 ` Grant Goodyear
2006-11-07 21:04 ` Elfyn McBratney
2006-11-07 21:20 ` Ciaran McCreesh
2006-11-07 21:44 ` Robin H. Johnson
2006-11-07 20:57 ` Ciaran McCreesh
2006-11-07 21:20 ` Seemant Kulleen
2006-11-07 17:43 ` Lance Albertson
2006-11-07 18:07 ` Alin Nastac
2006-11-07 12:24 ` Michael Cummings
2006-11-07 13:31 ` [gentoo-dev] " Duncan
2006-11-07 13:33 ` [gentoo-dev] " Paul de Vrieze
2006-11-07 14:06 ` Lance Albertson
2006-11-07 15:03 ` Michael Cummings
2006-11-07 15:35 ` [gentoo-dev] " Duncan
2006-11-07 17:37 ` [gentoo-dev] " Lance Albertson
2006-11-08 15:25 ` Aron Griffis
2006-11-08 17:02 ` Kurt Lieber
2006-11-09 15:00 ` Aron Griffis
2006-11-06 23:02 ` Alin Nastac
2006-11-06 23:03 ` Jakub Moc
2006-11-06 22:12 ` Mike Frysinger
2006-11-06 22:40 ` Harald van Dijk
2006-11-06 22:52 ` Mike Frysinger
2006-11-06 23:27 ` Alec Warner
2006-11-06 22:55 ` kashani
2006-11-07 1:06 ` Ciaran McCreesh
2006-11-07 1:15 ` Mike Frysinger
2006-11-07 1:18 ` Olivier Crête
2006-11-06 22:05 ` Alec Warner
2006-11-06 22:25 ` Danny van Dyk
2006-11-08 15:07 ` Kurt Lieber
2006-11-08 15:23 ` Grant Goodyear
2006-11-08 16:58 ` Georgi Georgiev
[not found] ` <455211B0.5080202@gentoo.org>
2006-11-08 17:37 ` Kurt Lieber
2006-11-09 19:11 ` Daniel Ostrow
2006-11-08 21:55 ` Danny van Dyk
2006-11-05 11:22 ` Jakub Moc
2006-11-06 19:31 ` Chris Gianelloni
2006-11-06 19:41 ` Jan Kundrát
-- strict thread matches above, loose matches on Subject: below --
2007-11-01 5:30 Mike Frysinger
2007-11-05 15:31 ` Wernfried Haas
2007-11-07 21:18 ` Petteri Räty
2008-11-01 5:30 Mike Frysinger
2008-11-10 21:56 ` Donnie Berkholz
2008-11-13 5:54 ` Donnie Berkholz
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