I think any reference to DKIM better belongs to a hypothetical 5322bis.
Whatever it does, it's not related to the envelope.
Makes sense, that's how SPF + DKIM were designed. SPF for SMTP
+ DNS + Return-Path, DKIM not depending on SMTP for full message
header lines including a From:.
I agree some reference to SPF would make sense (for the purposes
of Dave's erratum though I think removing the sentence in question
is the best solution).
Not mentioning SPF would be odd, after all its "FAIL" feature fixes a
serious 2821-SMTP issue. It could go into the security considerations.
-Frank
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