Fixes and clarifications.

[email protected] wrote in
 <178743543291.195673.15867026862366754648@dt-datatracker-786f84c586-vck88>:
 ...
 |   Title:   DKIM Access Control and Differential Changes
 |   Name:    draft-nurpmeso-dkim-access-control-diff-changes-13.txt
 |   Pages:   42
 |   Dates:   2026-08-22
 ...

- Fix: do not include hp-outer in header field database (HFDB).
  Presence would signal message invalidity.
  (We could, however, check *that*.  It would make sense.)

- Do not include Resent-* block header fields in the HFDB.
  They are potentially multi-instance, and we neither defined to
  "replace" them for an effective single-instance block, nor do we
  actually want to do so.

- Clarify HFDB covers only single-instance header fields.
  (Going down from 42 to 34 DB entries.)

- Clarify the DKIM/ACDC D flag means "invalidated-difference",
  to be set only when elder signatures break.
  
- Clarify (thus) that DKIX-DC: (differential changes) header
  fields can regulary occur, even without D flag.

It is better.

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)

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