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Re: current usage of AAAA implicit MX?

2008-04-07 15:51:46

John C Klensin wrote:
--On Sunday, 06 April, 2008 22:44 -0400 "Robert A. Rosenberg"
<hal9001(_at_)panix(_dot_)com> wrote:
Remember that the A-Fallback behavior is ONLY due to the
needs (back in the 1980s) 
Someone would need to check with Craig Partridge, but I believe
that "only" (or "ONLY") in the above is not strictly correct.
It may have been the primary reason, but, no matter how often
"only" is repeated a desire to permit minimal configurations
did, I am quite sure, figure in to the equation.

A side discussion about history might be interesting, but I'll suggest that i
should not really be a factor for the current discussion.  The reasons are:

1. It has a substantial installed base of use now.

2. There is a benefit in the feature, by virtue of reducing the effort to cre
and email receiving service, and in some environment the reduction is quite 

3. It is not generally recognized as causing any problems now.

        It has unwanted consequences.   With the drop of WKS email went
        from "all machines that wanted email" to "all machines".  All
        this is trying to do is restore that distinction.
What we need to do with this thread is end it.



   Dave Crocker
   Brandenburg InternetWorking

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews(_at_)isc(_dot_)org