"v=1" doesn't have to come first. It just usually does. I think there was
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.
John Levine, johnl(_at_)iecc(_dot_)com, Primary Perpetrator of "The Internet for
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