A security study measured SPF, DKIM, and DMARC adoption across 400 French SMB domains, finding that 91.8% have valid SPF records but only 28.8% actively enforce DMARC policies (quarantine or reject). The research reveals a significant gap between publishing email authentication standards and actually applying them to block spoofed messages.
MailAuthGuard is a Node.js/TypeScript client for auditing email domain authentication and deliverability across SPF, DKIM, DMARC, BIMI, and MTA-STS standards in under 30 milliseconds, providing aggregate health scores and compliance checks against 2024 Google and Yahoo bulk sender requirements.