If you want to implement a similar effect to the new yahoo and
aol DMARC policy by SpamAssassin, use rules similar to the
default rules in 60_adsp_override_dkim.cf:

  adsp_override yahoo.com      custom_med
  adsp_override yahoo.com.ar   custom_med
  adsp_override yahoo.com.au   custom_med
  adsp_override yahoo.com.br   custom_med
  adsp_override yahoo.com.cn   custom_med
  adsp_override yahoo.com.hk   custom_med
  ...

-sm writes:
I did a quick verification. The above domains do not publish an ADSP record.

Indeed. This is precisely the reason it is useful to *override*
by a local rule whatever some domain publishes or not publishes.

  Mark

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