Public DNS checks
The free DMARC, SPF, DKIM, BIMI, and MTA-STS tools read records already published in public DNS. Browser-based checks use Cloudflare and Google public DNS resolvers.
Security and data practices
What the public website tools do, what stays in your browser, and what to confirm before product onboarding.
Local report analysis
Files added to the free DMARC report analyzer are unzipped and parsed in your browser. The report file is not uploaded by the analyzer.
Controlled enforcement
The recommended rollout begins with monitoring. Legitimate senders are identified and corrected before a domain moves to quarantine or reject.
Questions before onboarding
Ask us about product data flow, retention, residency, access, or procurement requirements before connecting a production domain.
Report a security concern
Send a clear description, affected URL, reproduction steps, and impact. Do not include secrets or personal data in the first message.
Email security support