>> DMARC is estimated to cover at least 60% of the world's mailboxes. > >That's an interesting number, but how was it computed/counted, >and what does it mean in reality. It certainly means Gmail, Yahoo, Hotmail, AOL, and all their various hosted services such as AT&T ISP mail in the US, as well as giant US cable ISP Comcast. >When the @yahoo.com reject policy had been set up, I checked whether >I could send fake @yahoo.com Email to my private German (F)reeMail >account and to my own company email account, and both Emails were >properly delivered to my Mailboxes. It's more popular among large providers than small ones. R's, John