Re: [exim] Proposal: $message_body_hash_sha1

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Author: Heiko Schlittermann
Date:  
To: exim-users
Subject: Re: [exim] Proposal: $message_body_hash_sha1
Hello Phil,

Phil Pennock <exim-users@???> (Sa 12 Jun 2010 07:37:09 CEST):
> On 2010-06-11 at 23:34 +0200, Heiko Schlittermann wrote:
> > Ian Eiloart <iane@???> (Fr 11 Jun 2010 18:25:45 CEST):
> > > >>Or is this something useful for other Exim users, too?
> > > >
> > > >Could be - in case we have to prove that we didn't change the message
> > > >after reception (the hash has to be signed, of course).
> > > So, why not use the DKIM features?
> >
> > Stupid question maybe: does the DKIM signature include the message body?
> > (I always thought, it's only a signature for selected header fields.)
>
> Yes, it includes the message body; otherwise a spammer could just
> include the headers from a valid message and a new body and pump out
> spam which verifies as coming from an identity that they do not actually
> have administrative control of.


Hm. With a bit more thinking I could have answered myself.

Thus, your proposal sounds promising. If it works as I understand *now*, we can
"abuse" DKIM.

Thank you.

--
Heiko