Re: [Exim] Rejecting forged local addresses

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Author: Philip Hazel
Date:  
To: Miles Davis
CC: exim-users, Jeremy Koch
Subject: Re: [Exim] Rejecting forged local addresses
On Tue, 23 Jul 2002, Miles Davis wrote:

> I don't suppose anybody has come up with a good way of implementing at
> least a limited version of this? Like, if the email did not at some point
> originate from something in host_accept_relay then deny it? What I guess I
> want is something that looks through the recieved lines for a match to one
> of my systems (not that those can't be forged, but I haven't seen that
> yet).


Forged Received: lines have been seen, so I don't think there's any hope
there. The only possibilty I can think of would be something
cryptographic, but I'm not a crypto person, so haven't any concrete
ideas.

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.