On Jun 2, 2007, at 8:21 PM, Hallam-Baker, Phillip wrote:
Steve,
Could you expand on this somewhat?
We may be able to push the beastly wildcard issue into touch
altogether here.
I suspect not, but it's worth a try.
What is the deployed base for MX . ?
I've no idea. I have a zone file and some survey code, but haven't
pointed
it at that question yet - it may be time to take a look.
How widely is it recognized?
Fairly widely, I suspect, by spam filters that look for a deliverable
email
address in the envelope from. All "MX ." does is provide an invalid
MX record that's easily recognized as being intentional (similar to
the .invalid pseudo-TLD in many respects).
http://ietfreport.isoc.org/idref/draft-delany-nullmx/ is the
(expired) draft
that formalizes the concept, and it was somewhere between discussed
and common knowledge for at least a couple of years before it was
drafted in '05.
Used?
Not as widely as I thought, apparently. I'm not sure.
Cheers,
Steve
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