Steffen Nurpmeso wrote in
 <20230810150536.5k9uk%stef...@sdaoden.eu>:

much too much was written it seems.

  ...
 |A nice property would be that all (possible forms of) needed
 |sub-signatures could be generated in parallel, a task that (most

Except for the one which requires the "domainkey-encrypt" of the
recipient domain, of course.
But this would be a top candidate for caching, and already the
second message send to its domain could avoid creating any
subsignature but that

  |[1]   + if DNS per-domain (eg) "domainkey-encrypt" is found
  |        . create DKIM subsignature for domain, include all
  |          rcpt-to:<> that reside on that domain within it,
  |          encrypted with "domainkey-encrypt".

  ...
 |Thank you.

Yes.  Greetings from Germany.

--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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