I haven’t done extensive research but here is a live example where treewalk will cause a result change. 

From: is in the domain Ret.bmcc.cuny.edu which has no DMARC record. 

_dmarc.bmcc.cuny.edu.    300    IN    TXT    "v=DMARC1; p=quarantine; fo=1; rua=mailto:[email protected]; ruf=mailto:[email protected]"

_dmarc.cuny.edu.    3325    IN    TXT    "v=DMARC1;" "p=none;" "rua=mailto:[email protected],mailto:[email protected];" "ruf=mailto:[email protected],mailto:[email protected];" "fo=1"

Elizabeth Zwicky
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