Enter the primary domain or subdomain you want to audit, without protocol (no https://).
Leave empty to auto-detect with common selectors (default, google, selector1, mail, s1, s2). Use this if your provider uses a custom selector.

What Does This Security Check Cover?

Email Authentication

Checks SPF, DKIM, DMARC and BIMI, including recommended policy levels and selectors for stronger protection.

SSL / TLS & HSTS

Validates SSL issuer, expiry window, and HSTS status to reduce downgrade and man-in-the-middle risks.

DNS & Transport Security

Looks for DNSSEC, CAA, MTA-STS and TLS-RPT, plus improvement tips for better email transport security.

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