Re: [Exim] Final Peer Review Sought: "Spam Filtering for MXs…

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Author: Tony Finch
Date:  
To: Tor Slettnes
CC: Chris Edwards, Exim User's Mailing List
Subject: Re: [Exim] Final Peer Review Sought: "Spam Filtering for MXs" HOWTO
On Mon, 12 Jul 2004, Tor Slettnes wrote:
>
> It is true that sender callouts are of limited use, since they only
> verify the validity, not the authenticity of the sender address.

If the sender signs their return path addresses then callouts verify
both validity and authenticity. This is a powerful anti-forgery mechanism.

Tony.
--
f.a.n.finch <dot@???> http://dotat.at/
FISHER: NORTHWEST 6 TO GALE 8 BACKING WEST 5 TO 7. SHOWERS. GOOD.


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