Tools

Free, instant email-authentication tools. No signup, no ads, no third-party trackers.

Email

All checks in one click. Letter grade + per-section findings.

Parse a record, count DNS lookups, catch the 10-lookup limit.

Pick ESPs + IPs and get a clean record.

Read the policy at _dmarc.{your-domain}.

Wizard for a safe, conservative DMARC record.

Look up a selector and inspect the key.

Probe 50+ known ESP selectors automatically.

List mail exchangers + resolve A/AAAA in parallel.

Verify logo + DMARC enforcement + VMC.

Deep dives on every standard, plus a step-by-step DMARC rollout guide: read the explainers →