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List:       exim-users
Subject:    Re: [exim] Alterating / Intercepting bounce messages
From:       "John W. Baxter" <jwblist () olympus ! net>
Date:       2004-10-30 17:21:41
Message-ID: BDA91BB5.17D8E%jwblist () olympus ! net
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On 10/30/2004 5:48, "Chris Edwards" <chris@eng.gla.ac.uk> wrote:

> And John W. Baxter wrote:
> 
> > Look into SRS (which is what was supposed to fix the forwarding problem for
> > SPF).  You encode the original return path into a verifiable return path you
> > generate...when the bounce comes you verify that the purported target
> > address of the bounce came from your server and if so extract the original
> > return path part.
> 
> I think you've lost me there.  Once the MX has accepted a mail to an
> unknown user, then it's too late to do anything useful and the old dilemma
> applies.  Silently drop the mail (breaking reliability) ?  Or spam the
> forged sender with a bounce ?  The former (drop) is more acceptable as it
> only impacts oneself and one's own correspondents, not the whole of the
> net.

It does help solve the problem Mark presented (it allows him to get the
bounce and to pass it on to its innocent victim).  We've already covered, I
think, the idea that that is not a useful problem to solve.

  --John

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