Email Security Threats & Defense Guide (Cross-platform)

Comprehensive reference for enterprise security teams combating phishing, BEC, and email exploits

📖 Document Overview

This technical manual covers modern email attack vectors and mitigation strategies:

🔍 Attack Methodologies

✔ Credential Phishing

Business Email Compromise (BEC) tactics

Weaponized attachment analysis (PDF, DOCX)

Link hijacking techniques

✔ Protocol Exploits

SMTP injection flaws

SPF/DKIM/DMARC bypasses

NTLM relay via email clients

✔ Advanced Threats

Steganographic payloads

QR code phishing (Quishing)

AI-generated social engineering

🛡️ Defense Framework

• Technical Controls

MTA hardening (Postfix/Exchange)

Attachment sandboxing

AI-powered anomaly detection

• Policy Measures

DMARC policy enforcement (p=reject)

User training simulations

Incident response playbooks

⚖️ Legal Considerations

Compliance with CAN-SPAM Act

GDPR email security requirements

Forensic evidence preservation

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