At 11:56 -0400 on 10/30/2011, John C Klensin wrote about Re: 4yz
Temporary Rejections is part of the SMTP Protocol:
> If the intent is know to issue a maintenance notice, then I
would probably not activate AUTH. So it becomes:
<connection>
S: 220 hi
C: EHLO me
S: 250 SMTPRETRY
>...
Independent of the details, switching the set of extensions
offered when the server was effectively unavailable for a while
in the EHLO response is an option that hadn't occurred to me
that that I think makes a lot of sense.
It is IMO also in line with the intent of the EHLO reply in that it
documents those extensions that the server is able/willing to
support. If the server is currently unavailable, it should only
report those extensions that it can support in its current state - In
this case that if requested it will report when it expects to be back
in operation.