Section 4.1 paragraph 3 talks about the service type (s=) constraint in
key records, and goes on to say that it is helpful when delegating
signing authority. s= was included to provide expansion capability
should, at some point, some service other than email decide to use
DKIM. If and when some other service does use DKIM, the ability to
constrain a key to signing email only would help delegation. In the
meanwhile, there isn't any benefit to delegation as a result of s=.
I suggest that the paragraph be deleted.
-Jim
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