The ones I wrote certainly didn't require v=1 to come first. ;-)

But you're right: there's probably cause to be concerned.


´╗┐On 2/8/18, 10:08 AM, "ietf-dkim on behalf of John R. Levine" 
< on behalf of> wrote:

    > "v=1" doesn't have to come first.  It just usually does.  I think there 
    > a version of RFC4871 that did that, but then when challenged we couldn't
    > come up with a good reason to keep it that way.
    I wonder how many DKIM libraries will accept a signature where it doesn't.  

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