[ietf-dkim] More interesting data

[Murray S. Kucherawy]

Naturally, moments after posting an update to the implementation report, some other interesting data came to light.  One of our project members decided to start watching the DNS for what queries were hitting his nameservers after turning up DNS signing.  The result included queries for policy at some really old locations, including _policy._domainkey.<domain> (one of the early SSP locations, I believe) as well as _domainkey.<domain> (DomainKeys).

It might be interesting to determine how widespread these implementations are even though they're very obsolete by now.  If I can get some statistics about this to include in the report, I'll do so for -04.

-MSK