Email Authentication Checker API
SPF, DMARC, DKIM and more from DNS, as a graded report
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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.
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PH · launched Oct 22, 2026 · 1 upvote (top 67%)
- Horizontal
- Dev tools
- Developer
- Not AI
- Commercial product
- API
- Developer Tools
Similar launches
See all 194 similar launches →Could you build this?
Yes The checker performs DNS lookups and validates records against published RFC rules, which is deterministic logic that a developer can implement and expose as a JSON API.
Competitors
Other products that read as similar to this one : 194 launches clear the similarity bar, closest 8 shown.
Attention rank: #80 of 195 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 355 days after the earliest competitor.
- MailSenpai DNS Check · ph · 2026-10-13 · 1 upvotes · similarity 0.81
- Mail Health Report · ph · 2026-10-17 · 1 upvotes · similarity 0.77
- LayerCall Free Email-DNS Tools · ph · 2026-09-06 · 1 upvotes · similarity 0.72
- SPF & DMARC Checker · ph · 2026-10-18 · 1 upvotes · similarity 0.71
- SenderCheck · ph · 2026-10-06 · 1 upvotes · similarity 0.71
- DNS Auth · ph · 2026-10-27 · 1 upvotes · similarity 0.69
- OutboundAuth · ph · 2026-10-01 · 1 upvotes · similarity 0.68
- dmarc.quest · ph · 2026-10-25 · 2 upvotes · similarity 0.67
Other launches for this product
- No other launches for this product.