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

[Paul Vixie]

On 2012-06-23 9:54 PM, Florian Weimer wrote:
> ...
> Perhaps it's time to admit defeat, call our legislators, and suggest
> that they mandate source address validation by service providers.

it's been time and past time for that since the internet was first
commercialized and privatized.

not only mandating it in the enterprise, but in the isp, and in peers of
the isp.

economics favour NOT doing this. it will NOT be done, at scale, voluntarily.