SMTP is not such a great success either. It has fading into irrelevance for a long while already. Private comms have been shifting towards facebook/whatsapp/wha

SMTP is not such a great success either. It has fading into irrelevance for a long while already. Private comms have been shifting towards facebook/whatsapp/whatever, and corporate which held to email longer is now shifting towards slack/teams. Even with email SMTP is becoming less relevant with the rise of Microsoft-Google duopoly. Come to think of it, SMTPs decline and XMPPs failure coincide pretty well.