The appendix of draft-ietf-dkim-ssp-03 which contains "Usage Examples"
discusses a number of use cases, but actually contains no examples of the
contents of the TXT record that would be used in any of those.
Either the use cases should also include the corresponding TXT record to
be used (or recommended), or another appendix should be added that shows
some actual examples of {S,A,AD}SP in use.
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