Maybe it can be reworded:
A single domain name that is the mandatory payload output of DKIM and
that refers to the identity claiming responsibility for the signed
message introduced into the mail stream.
+1
This nicely removes reference to the act of introducing and, indeed, that act
isn't really what DKIM covers, per se.
However I suggest adding the usual waffling qualifier:
claiming (some) responsibility
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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