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

Patrick W. Gilmore patrick at ianai.net
Sun Jun 10 12:59:23 UTC 2012

Composed on a virtual keyboard, please forgive typos. 

On Jun 10, 2012, at 5:36, "Dobbins, Roland" <rdobbins at arbor.net> wrote:
> 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.

If you need to do multiple queries (e.g. TXT & MX), is it better for either side to do two queries instead of one?


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