Try any of 817 endpoints — live.
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Full email-health audit: SPF + DKIM + DMARC + MX + BIMI + MTA-STS + TLS-RPT + DNSSEC + blacklist, plus a 0-100 deliverability score and letter grade.
The domain to inspect (a bare host like github.com; a full URL, a leading www., or a full email address are accepted and normalized to the registrable domain).
DKIM selector (the label before ._domainkey, e.g. 'google', 'selector1', 'k1'). Omit to autoscan ~30 common ESP selectors. DKIM selectors are provider-specific — pass the exact one if you know it.
Optional comma-separated list (or array) of DKIM selectors to test instead of the common-selector autoscan.
BIMI selector (default per the BIMI spec is 'default').
If true, skip the DNSBL reputation lookups in 'check' (faster; blacklist is the slowest section — many IP×zone DoH queries).
curl -X POST https://api.reefapi.com/email-health/v1/check \
-H "x-api-key: $REEF_KEY" \
-H "content-type: application/json" \
-d '{"domain":"google.com"}'Hit Send to run this endpoint live.