One of the OpenDKIM data collectors also sent me some data about DKIM-related
DNS queries he saw in one day of traffic. It's not appropriate to add to the
interop report since it's policy-specific and not specific to DKIM base, but I
thought it might be interesting to share here.
One day of traffic included 7150 policy queries of some kind. Of those:
2513 (35.1%) were for _adsp._domainkey.* (RFC)
2 (~0.04%) were for _asp._domainkey.* (mid-WG)
39 (0.55%) were for _ssp._domainkey.* (early WG)
538 (7.5%) were for _policy._domainkey.* (Allman, I think)
4057 (56.7%) were for _domainkey.* (pre-WG)
There's apparently still a huge installed base of DKIM verifiers that are
checking the pre-WG policy stuff either instead of or in addition to ADSP
records. And, amazingly, there are still a few implementations running that
use various pre-RFC versions of what the WG was doing.
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