Re: IANA SMTP registry

http://cr.yp.to/smtp/ehlo.html includes a list of all the extension
names I've seen from SMTP servers.

The goal of the list is to prevent accidental conflicts. That's why ONEX
and VERB and various X* names are listed. I'm not going to limit the
list to IETF projects; that would interfere with the goal.

Let me know if you have any new names.

---Dan