I think I read Comcast is deploying this DMARC strategy like Yahoo has. Gmail works
good although you won't get a copy of your message sent to the list. You'll want to turn
that off in your list setting because your bounced copies count as soft bounces and once
you hit level five, the list server disables your account. You will be able to send to the list
as I understand, but your copy and other list comments will bounce. Get a Gmail account
or one from some other mom and pop mail service who isn't implementing this BS domain