Free deliverability tool

Domain Reputation Calculator

Enter a sending domain. We run real DNS lookups on SPF, DKIM, DMARC and MX, scan major DNSBLs, then return a single 0–100 deliverability score.

How the score is calculated

We weight each check by how much it actually moves inbox placement in 2026:

  • SPF (25 pts) — record present, with a strict -all or soft ~all qualifier.
  • DKIM (20 pts) — a published key on a known selector. Multiple selectors are common; we probe Google's by default.
  • DMARC (25 pts) — full credit for p=reject, partial for quarantine, minimal for none.
  • MX records (15 pts) — the domain can actually receive replies.
  • Blacklist (15 pts) — clean across the major DNSBLs we scan.

What the score doesn't see

Reputation also depends on engagement signals: open and reply rates, spam complaints, and the warmup history of your individual mailboxes. Those don't show up in DNS — they're built through consistent sending behaviour over weeks.

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