Before you report your personal experiences, could you include data about the
receivers, please?
Well, here's a little bit of my data. Over the past day, my busiest
DNS server has seen 2014 lookups of _domainkey records, of which only
38 were for _adsp.
A surprisingly high 806 requests from 486 hosts were for plain
_domainkey with no selector. I can't tell if they were looking for
the old DK policy record, or if their DKIM implementations were
broken. I also saw 541 requests for _policy._domainkey, which was
used in a few drafts back in 2005, and 244 for _ssp.
Somewhat to my surprise, the 38 _adsp requests were from 34 different
hosts, but it's still fair to say that the fraction of hosts doing
_adsp lookups is very small, so it's not surprising that there's no
observable effect, good or bad.
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