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

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.
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