Evaluation measures best practice alignment with global email authentication and transport security standards, including IETF RFCs governing SPF (RFC‑7208), DMARC (RFC‑7489), DKIM (RFC‑6376 and RFC‑8301), MTA‑STS (RFC‑8461), DANE (RFC‑7672), TLS reporting (RFC‑8460), SMTP (RFC‑5321), Null MX (RFC‑7505), modern TLS protocols (RFC‑8996) and CAA records (RFC‑8659). Benchmarking incorporates security and compliance frameworks: ISO/IEC 27001, 27017, 27018; SOC 2 Type II; PCI‑DSS v4.0; HIPAA/HITECH (USA); GLBA (USA); SOX (USA); FFIEC (USA); GDPR and DPA (EU/United Kingdom). Additional sectoral and regional governance frameworks benchmarked against include: NIST SP 800‑177, NIST CSF, FedRAMP, CISA (USA); NCSC Cyber Essentials (United Kingdom); BSI C5 and BaFin/FINMA‑aligned guidance (Germany and Switzerland); ANSSI SecNumCloud and HDS (France); ACSC Essential Eight (Australia); NZISM (New Zealand); PIPEDA (Canada); MTCS (Singapore); NISC and ISMAP (Japan); KISA (South Korea); CERT‑In and DPDP Act (India); CAC and Cybersecurity Law (China); NESA and UAE Data Protection Law (United Arab Emirates); CERT.br (Brazil); PDPO (Hong Kong); LGPD (Brazil); FADP (Switzerland).