See http://pobox.com/~djb/surveys/smtpextensions.txt. You missed ONEX,
VERB, and VRFY. There are also lots of X extensions that should be
documented.
CAPABILITIES|draft-ietf-fax-smtp-capabilities|Finding out server capabilities
I continue to be amazed at this proposal. Previous commentary:
: CAPS has surpassed ETRN in the ``Most absurd use of port 25'' contest.
:
: Has anyone informed the authors that store-and-forward mail systems do
: not provide an online end-to-end link from the receiver to the sender?
:
: Why would anyone even imagine putting this feature into SMTP? Is there
: something wrong with today's public-information retrieval protocols? I
: realize that ftpd and fingerd don't have enough hooks, but why not use
: httpd?
---Dan
Smaller, faster, safer than inetd+tcpd. http://pobox.com/~djb/ucspi-tcp.html