Free diagnostic
Inspect the SPF TXT record, terminal policy, duplicate-record risk, and direct DNS lookup mechanisms without storing the submitted domain.
A domain should publish one SPF record. This diagnostic exposes the record, its terminal all mechanism, and the mechanisms that directly trigger DNS lookups.
This free check is deliberately bounded. Use domain monitoring to track recursive includes, record drift, DKIM, DMARC, MX, transport security, and provider evidence together.
Live diagnostic
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.
Related
Review mechanisms and limits.
Inspect policy and reporting publication.
See why pass and alignment differ.
Open the public tool that helps diagnose one part of dmarc monitoring and sender authentication.
Read the supporting guide for practical context around dmarc monitoring and sender authentication.
Connect aggregate reports, source attribution, policy status, and alerts to the sender authentication dashboard.
Track DNS, TLS-RPT, provider reputation, and placement signals for the domains that carry production mail.
Compare validation volume, monitoring, API access, reporting, and workspace limits by plan.
FAQ
