Occasional proposals are created to change SMTP thoroughly or replace it totally. Just one example of This is often Net Mail 2000, but neither it, nor any other has manufactured Considerably headway in the facial area of the network effect of the massive set up foundation of basic SMTP. RFC https://newsgeneral.co.uk/your-ultimate-guide-to-getting-your-first-mortgage-why-jones-co-should-be-your-go-to-advisor/