Advogato: "With the 'death' and rebirth of ORBS and the "subscription only" change to MAPS, and overall the prevailing problem of
spam, it's time to do something. This article proposes (and asks for feedback on) a method using trust metrics.
Opt-out doesn't work. Contrary to my illustrious Senator Ron Wyden here in Oregon, I think opt-out isn't an close to an
RBL aka MAPS is now going to be a 'pay' service, and it wasn't very effective anyway.
ORBS, even after the fork, has never a huge deterrent either."