--On Friday, January 14, 2005 4:57 PM +0000 David Woodhouse
<dwmw2(_at_)infradead(_dot_)org> wrote:
Third, we could do only a single hop from one system to another. That's
what IP-based blacklists do, that's what SPF actually achieves, and
that's what CSV does. And that's what the proposed TLS-based system
would do, too.
I'm partial to this option.
However, I think we can do one step better, which is to carry the
signature for each single transaction with the message. This gives a
recipient more information with which to manage their black/grey/white
lists.
Add a reputation system on the side (separate work item) and then we've
really got something.
Jim