Check your protection rule (DMARC checker)

Your protection rule tells inboxes what to do with email that fails the other checks: let it in, send it to spam, or turn it away. Type your website's name and we'll check it. Free, no sign-up.

We read settings anyone on the internet can see. We change nothing. The check covers all your email settings, not just this one.

What it is

Protection rule (DMARC). Tells inboxes what to do with email that fails, and where to send reports about it.

Why it matters

Gmail, Yahoo and Microsoft now expect one from anyone who sends a lot of email. Without one, fakes in your name are much more likely to get through.

Problems we look for

Check the others too

Approved senders list (SPF)Email signature (DKIM)Full email check

See plansGet the fix for every problem, and a warning when something breaks. How it worksThree steps, about ten minutes.
Build 91 · d8c4753 · 2 Nov 2026, 13:17 UTC