[155131] in North American Network Operators' Group
Re: Is Hotmail in the habit of ignoring MX records?
daemon@ATHENA.MIT.EDU (Scott Howard)
Fri Jul 27 03:05:19 2012
In-Reply-To: <20120727024538.46BAF23125D1@drugs.dv.isc.org>
Date: Fri, 27 Jul 2012 00:04:40 -0700
From: Scott Howard <scott@doc.net.au>
To: Mark Andrews <marka@isc.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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.
