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Email Authentication Checker API
SPF, DMARC, DKIM and more from DNS, as a graded report
Check a domain's email authentication from DNS and get JSON back. SPF (with DNS lookup count), DMARC, DKIM, MTA-STS, TLS-RPT, BIMI and MX records are judged against the RFCs. You get coded issues, a grade (A+ to F) and a score out of 100. A second endpoint validates SPF, DMARC or DKIM record text you paste in, offline. Only DNS-over-HTTPS is used; the target's mail servers are never contacted.
Hi everyone, this is Email Authentication Checker API.
It checks a domain's email authentication records from a script or CI job. GET /v1/check?domain= reads the public DNS records over DNS-over-HTTPS and judges SPF, DMARC, DKIM, MTA-STS, TLS-RPT, BIMI and MX against the RFCs. The response has coded issues, a grade (A+ to F) and a score out of 100.
Details: SPF follows include and redirect and counts DNS lookups against the limit of 10. DMARC covers policy, pct, rua/ruf, alignment and organizational-domain inheritance. DKIM checks the selector you pass with selector=, or ten common selectors if you pass none, and flags weak, revoked or testing-mode keys. MTA-STS, TLS-RPT and BIMI are checked as DNS records only.
POST /v1/validate takes SPF, DMARC or DKIM record text and checks it offline, with no DNS lookups.
Limits: the grade is a heuristic score of the published records, not proof that mail authenticates. It does not send mail, verify message signatures, test deliverability or fetch the MTA-STS policy file. Not finding a DKIM selector does not mean there is none. Results are cached for 15 minutes (fresh=1 bypasses the cache).
Example: github.com returned grade D (68) on 2026-10-20, with SPF at 10 of 10 allowed lookups and two 1024-bit DKIM keys.
Where to find it: RapidAPI, API.Market and APIHub (Zyla is in review). Product site: https://email-auth.glowhalo.org
Feedback on the checks and the scoring is welcome.
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About Email Authentication Checker API on Product Hunt
“SPF, DMARC, DKIM and more from DNS, as a graded report”
Email Authentication Checker API was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #375 on the daily leaderboard. Check a domain's email authentication from DNS and get JSON back. SPF (with DNS lookup count), DMARC, DKIM, MTA-STS, TLS-RPT, BIMI and MX records are judged against the RFCs. You get coded issues, a grade (A+ to F) and a score out of 100. A second endpoint validates SPF, DMARC or DKIM record text you paste in, offline. Only DNS-over-HTTPS is used; the target's mail servers are never contacted.
Email Authentication Checker API was featured in API (98.8k followers) and Developer Tools (521.8k followers) on Product Hunt. Together, these topics include over 102.3k products, making this a competitive space to launch in.
Who hunted Email Authentication Checker API?
Email Authentication Checker API was hunted by GlowHalo. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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