Re: Implicit MX and A RRs

As the shepherd/pseudo-chair for 2821bis effort, our plan of action is 
going to be as follows:

   *)	the implicit MX issue needs to be resolved.
   *)	there are a few other small items that need to be resolved that
	will be detailed on the ietf-smtp@imc.org list

We'll give the discussion about one more week and then make a consensus 
decision. So speak up now.

	Tony Hansen
	tony@att.com

John C Klensin wrote:
> 
> --On Wednesday, 26 March, 2008 22:41 +1100 Mark Andrews
> <Mark_Andrews@isc.org> wrote:
> 
>> ...
>>> It would be needed until IPv6 takes over.
>> 	It will be needed even *after* IPv6 takes over.  There will
>> 	be lots of queries for A records long after the majority
>> 	of hosts don't have A records.
>>
>> 	We need to remove the implict MX from A to prevent the A
>> 	record lookups occuring as things currently stand.
> 
> Mark,
> 
> Whether that proposal is a good one or a bad one, it can't be
> done in 2821bis because that is a document moving from Proposed
> to Draft Standard and the implicit MX feature is _very_ widely
> deployed and used.  So, IMO, this discussion is not directly
> relevant to the (already closed) Last Call on 2821bis and should
> probably be move to the ietf-smtp mailing list.
> 
> Second, no matter what is done with standardization, it will be
> many, many years before one could count on those A RR lookups
> not occurring -- too much software out that that is very rarely
> updated.   The advantage of the "MX 0 ." approach over getting
> rid of the implicit MX from A is that, if there were consensus
> for it, it can be deployed in less than geological time.
> 
> But, either way, it seems to me that the correct (and only
> feasible) actions start with an I-D that says something useful
> and is discussed on, at least, the ietf-smtp list.
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