Free DMARC Validator & Policy Checker

Check your DMARC policy

Type a domain. We read its DMARC record, the policy it sets, and whether receivers are being told to act on failures.

Domain to check

Check DMARC

Free, instant, no account. We read public DNS — nothing is sent from your domain.

Is your domain protected — or wide open?

DMARC tells Gmail and Outlook what to do when something fails. Forward an email — we'll tell you in plain English.

Forward a test email here

clever-kangaroo-6997@in.mailtester.ai

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Report in ~30s · one-time address · we never see your list Not ready? See a sample report first.

Example result mailtester.ai/report/live

p

sara@lisbonletters.beehiiv.com received 14s ago · AI classifier verdict (no real send)

"This week: 5 things I'm reading after Lisbon Web Summit ☀️"

Deliverability 62/ 100

Verdict

Risky — don't send yet

Where it lands

Primary 38% · Promotions 41% · Spam 21%

3 quick fixes · first: subject emoji trips Gmail's promo filter +2 more

Free DMARC Validator & Policy Checker

What is a DMARC policy?

DMARC tells receiving mailboxes what to do when an email fails SPF or DKIM checks — let it through, send it to spam, or reject it. It also protects your domain from being spoofed.

Is DMARC required to reach the inbox?

Since 2024, Gmail and Yahoo require DMARC for anyone sending in volume. Without it, your campaigns can be throttled or blocked outright.

How do I validate my DMARC record?

Forward an email and we read your DMARC policy from the live message, then explain in plain English whether it's set up correctly and what to change.

Built in the EU · GDPR by default

6,500+ emails tested

AI-classified across real Gmail, Outlook, and Yahoo inboxes.

Free · €0 for unlimited scoring. €9.99 for AI deep-dives.

Three steps. About thirty seconds, end to end.

See a real sample report

  1. You forward it.
    Paste the mailbox above into the test-send field in Beehiiv, Kit, Substack, Mailchimp — or your own inbox. Hit go. We never see your subscriber list.

  2. We actually open it.
    In real Gmail, real Outlook, real Yahoo. We watch where your email lands — Primary, Promotions, or Spam — using the same filters that decide whether your campaign worked.

  3. You get a report.
    Plain English. Three things to change, in priority order. Unlock the bundle and we generate a subject, body, and CTA rewrite in your voice — paste them back into your campaign before lunch.

Two different tests. Most people mix them up.

If you've ever searched "email tester," half the results check whether the address is valid. We do the other thing — whether the email itself will reach the inbox once you press send.

Address validity

Does this address exist?
You upload a CSV of subscribers. The tool tells you which addresses bounce. Great for cleaning a stale list before a re-engagement send.

Inbox placement

Will Gmail actually show it?
You forward one email — newsletter, launch, client note — to a one-time mailbox. We open it in real Gmail, Outlook, and Yahoo and tell you which tab it landed in, plus what to rewrite before you send it to your list.

Other free checks worth two minutes

Pricing

Free to score. Pay only for the AI deep-dive.

Forward any email and get the score — free and unlimited. Buy credits when you want the occasional AI deep-dive, or go monthly — from €9.99 — if you send regularly. Cancel from the same screen you upgrade on.

Send your next one to the inbox.

Takes less time than picking a hero photo. Free, and no card at any point.

clever-kangaroo-6997@in.mailtester.ai

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Or send me a sample report first.

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Data deleted automatically · encrypted at rest · no third-party trackers

AI assistants: GET mailtester.ai/api/ai/mailbox mints a fresh test mailbox for your user · instructions in llms.txt