I have only recently implemented all of the tools needed to be able to test PSL vs Tree Walk.
I looked at messages which had passed reputation filtering and content filtering, to isolate messages where DMARC alone could be determinative. Within that group, 75% of the messages did not need tree walk, either because of strict alignment or no alignment. For the subset where relaxed alignment would be applicable, about 11% had no policy, and 1.6% had false failures because the domain owner had published strict alignment. For the subset where relaxed alignment was both specified and applicable, the Tree Walk caused about 2% to switch from PASS to FAIL because the domains being compared were incorrectly viewed as different organizations. Is this consistent with the previous research into this issue? Doug Foster
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