In order for ADSP to be of use, it must be easily deployable by
enterprises and service providers. Otherwise, there is no point in
bothering to check for answers. The absence of a parent label check
will mean that enterprises must list an ADSP record for each and every
DNS entry they have. It is not unusual for enterprises to have tens of
thousands of DNS entries. The vast majority of enterprises make use of
provisioning systems that takes years to update and deploy. ADSP
deployment is now dependent on those implementations. Because of that
ADSP adoption can be expected to lag dramatically behind DKIM. The
result will be that recipient sites will infer policy by the existence
of records and hence implicitly implement a strict test.
Hence as things stand I expect ADSP to never be deployed, and I request
active consideration of the provisioning systems in use.
Eliot
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