On Tue, 2004-04-20 at 16:01, Bill Mcinnis wrote:
It's really no different than submitting to and querying an RBL which
are already widely used.
For the receiver, not only DNS lookups are required to search for
possible "message signature agents", a query is also required of these
discovered entities for "every" message received. For the sender, this
happens for each message sent and for each message spoofing the domain
of the sending system (a problem not addressed by this scheme), placing
a burden on "message signature agents" now in the path of all mail
messages rightfully or wrongly carrying the domain of the sender. This
is a significantly different model.