If Big-Bank had been added after signing, verifiers are already authorized to delete that field from the message, according to the current PS. Isn't that enough?
I don't know any DKIM verifier that modifies the message, and I doubt that many people would want to use one.
Regards, John Levine, jo...@iecc.com, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. http://jl.ly
smime.p7s
Description: S/MIME Cryptographic Signature
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