On Apr 18, 2014, at 3:10 AM, John R Levine <johnl(_at_)taugh(_dot_)com> 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