> -----Original Message-----
> From: [email protected] [mailto:[email protected]] 
> On Behalf Of Mark Martinec
> Sent: Friday, March 11, 2011 10:09 AM
> To: IETF DKIM WG
> Subject: [ietf-dkim] draft-ietf-dkim-rfc4871bis-03: issues with 'z=
> Copied header fields'
> 
> [...]
> It would be beneficial if the rfc would at least recommend one order.
> It may seem obvious that a top-down order comes naturally, but
> considering that a signing algorithm walks through multiple occurrences
> of header fields bottom-up, the top-down order may no longer appear
> so natural.

[as participant, not co-editor]

I tend to agree, since this way one could definitively detect header field 
re-ordering.  Even though, via the "h=" semantics, DKIM is fairly resilient to 
re-ordering, it might be helpful during diagnostic work to be able to detect 
for certain that it has occurred.

> [...]
> In short, I think the paragraph should just be removed.

Agree here too.

-MSK

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