Guides
Category: Domain authentication
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DMARC alignment and a rollout that does not break mail
How DMARC alignment and policy work, why forwarding and lists break it, and a staged none-to-reject rollout with an ordered checklist.
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SPF and DKIM: how mail is checked, and how to publish them safely
How SPF and DKIM identify a sender, the 10-lookup limit, 2048-bit key splitting, and how to read an Authentication-Results header.