* Scott Brim: > On Tue, Oct 16, 2018, 22:37 Michael Thomas <m...@mtcc.com> wrote: > >> I believe that the IETF party line these days is that Postel was wrong >> on this point. Security is one consideration, but there are others. >> >> Mike >> > > I saw just a small swing of the pendulum toward the center, a nuanced > meaning for "liberal". The adage wasn't tossed out. Operationally it can't > be.
I think DMARC, as it is deployed right now, pretty much killed the “liberal” part for many people. It's sender policy, but it's necessarily enforced at the recipient end, but many recipients aren't given a choice to opt out when it is technically the wrong thing to do. You can switch email providers, but as the IETF never really designed for email address portability, that's a theoretical option only for many.
