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Re: SPF is fundamentally broken
From: Alex van den Bogaerdt (alex
ergens.op.het.net)
Date: Wed Jan 14 2004 - 06:22:43 CST
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On Wed, Jan 14, 2004 at 12:35:53PM +0100, Pierre Beyssac wrote:
> On Wed, Jan 14, 2004 at 12:09:31PM +0100, Alex van den Bogaerdt wrote:
> > On Tue, Jan 13, 2004 at 10:02:43PM -0500, Max Paperno wrote:
> > > Well first of all it's more work than necessary, but the ultimate issue
> > > is that it makes YOU responsible for the mail now. If it's undeliverable,
> > > YOU are responsible for the mail, which is going to cost you one way or
> > > another. A simple forwarding service turns into a process-intensive
> > > task with possible liability issues. No thanks.
> >
> > So, if you decide to forward your incoming mail to another place,
> > and if you make a mistake in doing so, _I_ should be responsible?
> >
> > No thanks.
>
> But that's exactly what you are doing by saying you can put your
> own address as emitter in somebody else's forwarded mail.
Sorry, but I can't make anything from your response.
> That's just one more proof that SPF is not workable, even from your
> point of view.
Let's assume that you are forwarding your mail to some other place.
You receive mail, from me, and you/your_system is trying to deliver
it to $otherplace.
U: "knock, knock".
O: "who's there?"
U: "Alex van den Bogaerdt"
O: "Sorry, you're not authorized to speak in behalf of AvdB"
O: "end of discussion"
(alternatively, the mail is tagged for manual review)
This is great news for me. I do not have to deal with *your* mistakes.
I do not want $otherplace to send _me_ a message. I have no business
with $otherplace.
Provided that I sent you the message directly (as opposed to via a list),
I have no objection agains a message from the system at "U" saying that
my message could not be delivered to "Pierre Beyssac". I do object to
a message from "O" saying my message could not be delivered to
"someonetotallyunknowntome
somewheretotallyunknownto.me"
You forward, you deal with the problems that arise from your action.
cheers,
Alex
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