Isn't that still an issue for this new protocol? My skim through the site gave me the impression that this system essentially addresses messages to a specific R

Isn't that still an issue for this new protocol? My skim through the site gave me the impression that this system essentially addresses messages to a specific RSA signing identity. I can just as easily choose to do that over SMTP, right? (I'm imagining sending to an SMTP email address encoded in the public signing key.)