Frank Ellermann wrote:
Actually a SPF PASS has one feature that a DKIM PASS doesn't
have: You can simply challenge an unknown SPF PASS. Whatever
the effect might be, it won't hit an innocent bystander. So
SPF PASS has value without complex "reputation" solutions, a
white list is good enough.
And THAT is exactly the point. There are those on the DKIM list that
are trying to make sure that DKIM won't mean a thing without their
proprietary Vodoo.
The Sender Signing Policy (SSP) can fix that if we do it right.
There are more threats out there to the future of free/open e-mail than
just patents.
Scott K