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The three records

SPF, DKIM and DMARC explained in the order they make sense. Start here if the acronyms are new.

3 steps

  1. SPF: who may sendThe list of servers allowed to send as your domain.Step 1 of 3
  2. DKIM: proving it wasn't alteredThe signature that survives the trip to the inbox.Step 2 of 3
  3. DMARC: what to do on failureThe policy that ties SPF and DKIM to a decision.Step 3 of 3