This doesn't change the problems of unreliable email because mail services are too aggressive, unfortunately.

We recently got a bounced mail (not dumped in a spam folder, actively rejected) from a major university, telling us that the message looked like unsolicited bulk mail. The message was sent directly to a specific single customer in response to a purchase they had just made, contained information that we were required by law to provide to them, and was sent from a reputable host with things like SPF properly set up. That is simply broken, and it is 100% the fault of the mail service admins at the university.