There are so many other problems with email that could be addressed by a new protocol, eg: spam, security.
There are measures to address these issues more broadly with SMTP, but they are not widely adopted, something that could be standardized in a new protocol, ie: encryption by default, message signing to prevent spoofing, encrypted transmission, etc.
There are measures to address these issues more broadly with SMTP, but they are not widely adopted, something that could be standardized in a new protocol, ie: encryption by default, message signing to prevent spoofing, encrypted transmission, etc.