JdeBPI have a suspicion that in a very small way I might have recently contributed towards a minor unshittification of Meta.
I was drawn into it as an SMTP problem.
I can only apologize to the world if it actually does end up making #Meta capable of sending e-mail once more. (-:
As a #qmail user of many years, who did similar work of my own for OS/2, and who was drowned with UBM to the point of just giving up on SMTP e-mail in the 2000s; I can heartily recommend the rejection of Relay clients that do not adhere to the SMTP.
Gresham's Law trumps Postel's Principle.
http://jdebp.info/deluge-of-microsoft-worms.html
http://jdebp.info/FGA/qmail-myths-dispelled.html#MythAboutBareLFs