[ietf-dkim] Core algorithm support/use, draft text v2

[Arvel Hathcock]

 > That comes back to the point that Ned et al made perhaps a week ago,
 > if we know that transition will occur at some point in the future,
 > leaving that code unexercised until then is surely a recipe for
 > disaster.

Whenever anyone is ready, send a message to dkim-test at altn.com with both 
signatures and you should get an auto-response containing an 
Authentication-Results header at the top with some detail about each 
signature verification.  I can also flip a switch here and start signing 
with both sha1 and sha256 to test your verifier when you're ready.

-- 
Arvel