How to use DMARC policy analyser
Read a pasted DMARC record and review policy, alignment, reporting and percentage tags. The check runs when you submit the form. Its inputs are processed in this browser.
How the check works
The parser reads semicolon-separated tags, flags duplicates and checks the version, p, sp, alignment modes and percentage syntax.
The Overview tab explains the findings. Measured data lets you search individual fields and values, while JSON report shows the complete export. Export JSON to retain a baseline, or print the findings for your own records. Review the report before sharing it: browser characteristics, token claims, and file names can reveal information about your setup.
Read the result in context
A reject policy asks receivers to reject failing mail subject to their local policy. Alignment and valid SPF or DKIM authentication still determine whether a message passes.
Understand the limits
The tool does not send mail, query DNS or verify permission for external report destinations. A syntactically valid record does not prove correct delivery.
Common questions
Where is the input processed?
In this browser tab. This tool does not submit its input to the site server or a third-party service.
What should I keep with a result?
Record the selected options, browser and time. Review exported values before sharing them. Generated passwords, tokens and HMAC secret keys are excluded from report exports.