DMARCIAN: Best Practices: Advancing Your DMARC policy

DMARCIAN just issued a engaging article:

Though there can be a wide variation of size, complexity and stage of a DMARC project, they all share a common challenge of understanding when it’s appropriate to advance your policy. This guide will touch on key considerations, milestone validation tips, and DNS syntax guidelines necessary to help you confidently progress your domains to a stringent DMARC policy of p=reject. DMARC Policies First, a brief overview of DMARC policies; the sequence in which they are traditionally applied; and how they vary in protections against phishing, spoofing and unauthorized use of your domains: The three policy modes are none, quarantine and reject. These policies are most traditionally applied in the sequence listed above. Under certain circumstances, it may be appropriate to apply a more stringent policy at the beginning if, for example, you are applying DMARC to a parked or inactive domain. Organizations that receive your email, will look at the

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