@tchambers I’ve heard of this but I’ve been worried about what it means for small/single user servers: who decides what goes on the denylist? Who decides what gets taken off the denylist? Presumably larger servers will have an easier time getting off than smaller servers, so aren’t we just recreating the incentives that have shaped how email is today (i.e. three or four big players get to interoperate and choose not to interoperate with many smaller services)