The Edit target policy card

Editing this form changes target_policy only — it does not publish anything to DNS. You still make that change yourself, once the R7/R8 recommendations (or your own judgment) say it looks safe.

p (domain policy) and sp (subdomain policy) are explained in full at DMARC fundamentals and the sp tag. Non-sending domain flags a domain that should never legitimately send mail — see why that matters.