Yeah. I think email receiving is a game of exceptions… the email receivers (In the business world it’s essentially just MSFT and GOOG of course) answer to the addressees because they are the customer, and those customers will start to shriek if their inbox doesn’t receive “Important Messages.” But GOOG or MS have no leverage over the senders in this case so they just add an exception: “if IP range is just right and message fault ___ is present, fix message” (or otherwise allow)

Of course, they do have leverage over “marketing email” senders since they can block it and no one will complain, so those senders always have impeccable compliance with every year’s new “anti-spam standard.”

Apple is another major player in the email receiving game for consumers. And they are awful, by far the worst of all the big providers. They do not send dmarc reports and they make it very difficult to tell why they accept some email and not others.