Free diagnostic

DMARC checker for policy and reporting publication.

Inspect a domain's DMARC record, enforcement policy, subdomain policy, percentage, and aggregate-reporting configuration.

Run DMARC checkDMARC monitoring

Publication is the starting point

A DMARC record tells receivers how to handle messages that fail aligned SPF and DKIM. This tool reports the published policy and whether aggregate reporting is configured.

  • p=none collects evidence but does not request enforcement.
  • quarantine and reject should follow sender inventory and alignment review.
  • A valid record does not prove every legitimate sender is aligned.

Move from a record to an operating workflow

Use DMARC monitoring to label sources, inspect alignment volume, identify unknown senders, and plan controlled enforcement.

Live diagnostic

Check current evidence

This anonymous tool is rate limited and does not retain submitted input. It reports observable evidence without promising delivery, authentication alignment, or inbox placement.

No SMTP mailbox probing, account lookup, or tenant data is used.

Enter an input to see current evidence, limitations, official references, and the relevant next step.

Related

DMARC rollout

Move from monitoring to enforcement safely.

SPF checker

Inspect adjacent SPF publication.

DMARC monitoring

Turn aggregate reports into sender intelligence.

Authentication diagnosis example

See how SPF, DKIM, DMARC, BIMI, MTA-STS, and TLS-RPT evidence becomes a remediation checklist.

DMARC monitoring docs

Connect aggregate reports, source attribution, policy status, and alerts to the sender authentication dashboard.

Domain monitoring docs

Track DNS, TLS-RPT, provider reputation, and placement signals for the domains that carry production mail.

Pricing

Compare validation volume, monitoring, API access, reporting, and workspace limits by plan.

FAQ