The playground

Try any of 1462 endpoints — live.

Pick an endpoint, load a working example, tweak the params, and send — no signup to try. Results render the way the data deserves; raw JSON, headers & code are one tab away.

Playground demo key · api.reefapi.com

post/email-preflight/v1/dns_auth1 credit

Sender-domain email-authentication summary (SPF/DKIM/DMARC/MX + deliverability grade) via an inner-call to the email-health engine — REUSE, not re-implemented here (email-health owns DNS auth; this is a thin preflight wrapper).

Working example

Parameters

domainrequired

dkim_selectoroptional

include_blacklistoptional

request preview

curl -X POST https://api.reefapi.com/email-preflight/v1/dns_auth \
  -H "x-api-key: $REEF_KEY" \
  -H "content-type: application/json" \
  -d '{"domain":"github.com"}'

Hit Send to run this endpoint live.