>DMARC algorithm.  Perhaps it is reasonable to fall back to the
>envelope sender in the absence of a message From: header?

No, this is way outside the scope of DMARC.  What do you think
it should do with From: lines like these?

  From: [email protected] <[email protected]>

  From: "Paypal security" <[email protected]>

Whatever the answer is, it's not part of DMARC.

R's,
John
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