I don't know of any public implementations of the other schemes.
Well, there's vouch-by-reference, third party assertions that a signing
domain is good. It has a few implementatons but it hasn't been a barn
burner either.
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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