Re: Is Hotmail in the habit of ignoring MX records?

[Scott Howard <scott () doc net au>]

On Thu, Jul 26, 2012 at 7:45 PM, Mark Andrews <marka () isc org> wrote:

> You don't lookup MX records for MX targets.  This is basic MTA
> processing.
>
> If the MX lookup fails, as apposed to returns nodata, you don't
> lookup the A/AAAA records and synthesis a MX record.  You treat it
> as a soft error and queue for retry later.  Again this is basic MTA
> processing.

And yet, Hotmail apparently is doing the exact opposite of that.  Which
means what 'should' happen or what 'should' be done isn't as relevant as we
would all it to be.  Given this, considering "unusual" things like the
target of an MX record having an MX record it - whilst completely
irrelevant for a well-behaved mail server - might actually be relevant
here...

  Scott.