Free tool

Verify evidence

Check for yourself that a message certified by Mailack is intact and that its NOM-151 certificate matches what was sealed. No account, no sign-up, nothing to install.

Proof bundleThe .json file handed to you by whoever sent the message.Archived message (.eml) — optionalWithout it everything is checked except the strongest part: that the document is exactly the one that was sealed.

Your files never leave your device

The check runs entirely in your browser. Neither the bundle nor the message is sent to Mailack or to any other server, and that is not a promise: it is what makes this verification worth anything.

If the check ran on our servers, the result would be Mailack asserting once more what it already asserts. Here your browser redoes the arithmetic.
You can save this page and use it offline.
You can read the code that performs the check: it is the same RFC 6962 algorithm the platform uses.