Hi John,
I've been out of the loop on this, so am just reading this as a "new
reader" and potential implementor.
I think there is two much details already. Just keep it simple.
"Here are two new codes:"
521 proposed text for 521
556 proposed text for 556
and just explain each one and when/why it can used. This should be an
addendum "insert" for a RFC5321 "manual."
It sounds to me that 521 is for "dummy" servers. You won't use this
for no other reason but to tell the client what?
"Do not call this DOMAIN again." or
"Do not try this IP again."
I think we are talking DOMAIN. The question I have is whether it is
really a PERMANENT thing? or it just for the transaction only? A 521
does not tell clients the attempted DOMAIN is a permanent "no mail
server" domain? Or does it? (Will it be used that way as a way to
help control mail blasters?)
Anyway, write this doc for people including those like me who are on
the engineering IETF side-lines. You guys already "know" whats
happening with the devil details. The "layman" software keeper of
established SMTP software just want to know the basics for plug and
play operations/cost/changes.
Thanks
On 9/7/2014 12:28 PM, John C Klensin wrote:
Hi.
To promote tidiness, I've just posted
draft-klensin-smtp-521code-02.txt. It responds to an extended
discussion on the Apps-Discuss list and some on the IETF llst
about the new nullMX spec, error codes, and RFC 1846. The scope
of the draft itself is intended to be quite narrow -- it updates
RFC 5321 by adding two codes, 521 and 556, to SMTP and defines
the uses for both. In particular, it takes no stance on whether
dummy servers such as those proposed in 1846 or nullMX DNS
records should be used at all.
I've directed discussion toward this list on the theory that the
substance of the I-D is really an SMTP matter. I assume the
draft will be handled as an individual submission.
best,
john
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