Email authentication and deliverability check for a sending domain: SPF (redirects followed, recursive DNS lookup count against the limit of 10), DKIM across up to 30 common selectors (plus any you name) with RSA key size, DMARC policy and reporting (a subdomain inherits its parent's), MX, MTA-STS, TLS-RPT and BIMI. Every problem is named with a one-line fix, and an A–F grade lists each deduction. For deliverability audits and spoofing-risk checks. Live DNS over HTTPS.

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