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SPF Validator API templates

A working app built on the SPF Validator API.

Deploy one to Vercel with your free API key and it's live in about a minute, or clone it from GitHub and make it your own. See all templates.

Grade any domain’s SPF and DMARC setup from A to F, with both records decoded and a checklist of what to fix.

Build with SPF Validator. One free key unlocks all 300+ APIs.

300+ APIs on the same key and the same response shape.