I crunched all the signed mail I've gotten since the beginning of 2010:
2010:
135 adsp -> dkim=all
5 adsp -> dkim=all;
1 adsp -> dkim=all; t=s
38 adsp -> dkim=discardable
194 adsp -> dkim=unknown
6 adsp -> dkim=unknown;
223 adsp -> noerror
8020 adsp -> none
2011:
59 adsp -> dkim=all
5 adsp -> dkim=all; t=s
11 adsp -> dkim=all;t=s
5 adsp -> dkim=discardable
22 adsp -> dkim=unknown
21 adsp -> noerror
2649 adsp -> none
"noerror" is mostly Yahoo, which has CNAMEs but no ADSP record. All
of the dkim=discardable is Paypal. Nearly all of the dkim=all was small
personal domains; the only large one I saw was paypal-inc.com.
orbitz.com and cert.org publish dkim=unknown
I also got about a dozen SPF and Sender-ID records, likely from
ill-advised wildcards.
So in my limited dataset, ADSP usage is if anything shrinking, with only
Paypal publishing discardable.
Regards,
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet
for Dummies",
Please consider the environment before reading this e-mail. http://jl.ly
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