PostureAudit, the email deliverability audit API

Why it surfaced

This is a sharply focused tool for the parts of email authentication that ordinary checkers often flatten into green ticks. It expands nested SPF includes, fetches and validates MTA-STS policies over HTTPS, identifies uncertainty around DKIM selectors, and returns machine-readable findings with specific fixes.

PostureAudit audits a domain’s SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, BIMI, and DNSSEC configuration in one API request.