Learn

Practical guides for DMARC and SPF decisions — what to do, when to do it, and how to explain it.

Decisions

When to move from p=none to p=quarantine When to move from p=quarantine to p=reject When to tighten SPF from ~all to -all How to identify legitimate senders before tightening policy

Understanding Reports

How to read a DMARC aggregate report Why mail can fail DMARC even when SPF passes DMARC forwarding and policy overrides explained Common causes of unknown senders

Taking Action

How to ask IT to make a DMARC policy change Sign in required How to ask IT to make an SPF change Sign in required How to explain DMARC/SPF changes to management Sign in required