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PSL Lookup Data
The PSD DMARC data set is proviced in the standard PSL data format and can be found here.
When using this approach, the input domain of the extension lookup is supposed to be the output domain of the regular PSL lookup, i.e. the organizational domain.
This alternative data approach is potentially useful since DMARC implementations already need to be able to parse the data format, so it should be easier to implement.