Spam would be a huge problem on it though if it were that widely used. It was just not designed to stand up to that kind of abuse. It lacks sender verification

Spam would be a huge problem on it though if it were that widely used. It was just not designed to stand up to that kind of abuse. It lacks sender verification etc. Just like SMTP is kludge upon kludge and totally broken, and nobody has done a real modern rewrite because nobody wants to deal with all the legacy.