"Note: ADSP is incompatible with valid DKIM usage in which a signer
uses "i=" with values that are not the same as addresses in mail
headers. In that case, a possible workaround could be to add a
second DKIM signature a "d=" value that matches the Author
Address, but no "i="."
With the change, we may need to sign the message more than once in
some circumstances if we are using the i= tag. That's an extra
overhead both for signers and verifiers.
Actually, you may have to sign twice if you want to use ADSP and you
happen to use i= values that don't match the From: address, regardless
of the semantics of your i=. Even if you intend the i= to be e-mail
addresses, they still don't have to match the From: address. That's
why I added the note you quoted.
Nothing in the proposed errata changes that.
R's,
John
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