Parent/Child error:
"within" should be "a parent of".
Edit correction:
2.8. Originator Signature
An "Originator Signature" is any Valid Signature where the d= tag
matches or is [a parent of] the Originator Domain (the domain of the
first From email-address). In addition, when a key is restricted by
its g= tag, the signature MUST BE valid for the Originator Address
(the first From email-address).
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