https://bugs.exim.org/show_bug.cgi?id=2180

            Bug ID: 2180
           Summary: DKIM oversigning
           Product: Exim
           Version: 4.88
          Hardware: All
                OS: All
            Status: NEW
          Severity: wishlist
          Priority: medium
         Component: DKIM
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]

An abstract control on oversigning policy.

Currently you can get oversigning by specifying one more header-name in
dkim_sign_headers than exists in the message - but that requires examining
the message and is complex.

We could

- have another option saying "always" or "never" oversign.  This would, in
  simplest implementation, apply to the entire list of headers and give
  either "N+1" or "only-if-present" signing respectively

- affix a flag to (any) header name in the list.  Eg prefix "+" means always,
  prefix "-" means never

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