Re: [ietf-dkim] z= question with X headers

> Perhaps:
>
> "A vertical-bar-separated list of select header field names and
> copies of header field values that identify the header fields
> present when the message was signed.  It is not required to include
> all header field names and values."
I've added essentially this wording.  Sorry for the confusion; it was 
definitely ambiguous.
eric

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