DMARC Guardian

For vibecoders who skipped email setup

Never set up SPF, DKIM or DMARC? Then anyone can send email as your domain.

Shipped with AI and never secured your email? DMARC Guardian shows who sends mail as you, and what to fix. 90-day trial (no credit card required), then free for 1 domain.

Don't know what those three are? You're who this is for.

See who sends as you — free →

90-day trial (no credit card required), then free for 1 domain.

  • See who sends email as your domain.
  • See what to fix in DNS, in plain English.
  • 90-day trial, no credit card. Then free for 1 domain.

The part nobody told you

  1. An AI agent built your app.
  2. The tutorial said "ship it".
  3. Nobody mentioned email security.
  4. Now anyone can send email that looks like it came from your domain.

Your customer pays the fake invoice. You find out last.

Hand-drawn: a developer asks "Who sends as you?", an arrow leads to "What to fix", and a second developer holds a shield with a green check.

Two answers. That's all you need.

Who sends as you? Every service that sends mail with your domain on it, and every stranger who tries.

What to fix. The exact DNS change, written so you can paste it. No email-security degree.

Free check

Could someone send email as your domain right now?

Type your domain. 15 seconds. No signup.

What Free includes

  • 1 domain
  • Dashboard and DNS health checks
  • 30 days of history
  • 500 emails a month tracked
  • Total senders, plus your single worst sender
  • Full breakdown of every sender — Paid plans

Included from day one of your 90-day trial. After the trial you keep Free.

Three steps. Most of it is waiting.

  1. Create your account. No credit card.

    Add your domain. You start a 90-day trial.

  2. Paste one DNS record we give you.

    We write it for your domain. If you can paste into your host's DNS screen, you can do this.

  3. Come back tomorrow.

    Inboxes send us reports about mail using your domain. Within about a day you see who sends as you, and what to fix.

What are SPF, DKIM and DMARC?

Three DNS settings that tell inboxes which senders may use your domain. If your host or AI agent never asked you about them, they're probably not set up. We check, and tell you what to change.

Will this block fake emails?

No. We show you who sends as you and what to fix. Inboxes decide what to do with mail that fails. We don't promise a block.

Do I need a credit card?

No. You get a 90-day trial with no card. After that you keep a free plan for 1 domain.

Don't be the last to know.

See who sends as you, and what to fix. 90-day trial, no credit card, then free for 1 domain.

See who sends as you — free →