Authentication

DMARC Checker

Check any domain's DMARC record. Inspect policy (none/quarantine/reject), pct, rua/ruf, sp, and alignment modes.

About this check

Inspect DMARC policy, alignment, and reporting addresses.

Frequently asked questions

What does the DMARC Checker actually check?: Inspect DMARC policy, alignment, and reporting addresses.
Is this really free?: Yes. Every on.bo tool is free, no signup required, no rate-limit tricks.
Do you store the data I check?: We log minimal metadata to keep the service healthy. Lookups themselves are not retained beyond short-term caching.