On Apr 18, 2014, at 3:10 AM, John R Levine <johnl@xxxxxxxxx> wrote: >> Are you saying that gmail and yahoo have to know about my lists.sandelman.ca >> before I can have gmail/yahoo members on my little local list? > > Yeah. It's clear from the DMARC summary reports I'm getting that the big mail systems already have a pretty good idea of where the mailing lists are, They know about big lists. Maybe even IETF lists. But do they know about sandelman.ca? Do they know about @irtf.org? I really don’t like specs that work well only for large companies. Yoav