I don't see this draft being discussed yet, but do have a couple of
1. AFAIK, the only "security problem" with SMTP VRFY was information
leakage, i.e. that it provides a simple means to check which local parts
are valid without actually sending an e-mail. Your proposal does the
same, and makes it even easier. Is my understand correct, and if so,
what's your intent?
2. There is no reference to the need to treat a '.' in the local part as
part of the label, and not a label separator. DNS guys know this, e-mail
implementers may not...
Ray Bellis, MA(Oxon) MIET
Senior Researcher in Advanced Projects, Nominet
e: ray(_at_)nominet(_dot_)org(_dot_)uk, t: +44 1865 332211