Email deliverability check

Enter a domain for the full mail picture — MX servers and their IPs, the email provider, and all three auth records (SPF, DKIM, DMARC) — plus a blocklist (DNSBL) check on the mail-server IPs. All in your browser.

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What each record does

• MX — the servers that receive your mail. Lower priority number = tried first; same priority = load-balanced.
• SPF — lists who is allowed to send as your domain. Missing SPF = far more spoofing and spam-foldering.
• DKIM — cryptographically signs your mail. We probe the common selectors (a domain can have several); if none are found it may use a custom selector we didn't guess.
• DMARC — tells receivers what to do when SPF/DKIM fail. p=reject or p=quarantine is strong; p=none is monitor-only; missing means no policy at all.
• Blocklist — if a sending IP is on a DNSBL, your mail gets bounced or junked. Most relevant for self-hosted mail (for Google/Microsoft the IPs aren't yours).

FAQ

What does this email deliverability checker show?
For any domain it lists the MX servers and their IPs, detects the email provider, and checks all three auth records — SPF, DKIM and DMARC — plus a mail-server blocklist (DNSBL) check.

Why does it say DKIM "not found" when I have DKIM set up?
DKIM lives on a selector, and this tool probes the common selectors only; if yours uses a custom selector it won't be detected even though DKIM is working.

What does a DMARC policy of p=none mean?
It means monitor-only — receivers are told to take no enforcement action on mail that fails SPF/DKIM. p=quarantine or p=reject are the enforced, stronger policies.

Is this free and private?
Yes — free, no sign-up. The checks run in your browser and nothing is stored.

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