[dns-operations] Why would an MTA issue an ANY query instead of an MX query?

[Dobbins, Roland]

On Jun 10, 2012, at 6:25 PM, DTNX Postmaster wrote:

> A single ANY query for a domain gives you the NS, MX, TXT and SPF records, plus any A/AAAA record present. At scale, who knows, the reduction in number of queries probably adds up.

It strikes me as laziness and cost-shifting.

> And then there's the information harvesters, who query hosted domains in sequence. They actually seem to account for around 40% of our 'normal' ANY traffic with just a few IP addresses.

They don't count.

;>

-----------------------------------------------------------------------
Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

	  Luck is the residue of opportunity and design.

		       -- John Milton