Guide overview · 11 chapters · Stop the Attack

Why phishing still works

Phishing remains the most common way into an organisation because it targets people, not systems.

  • By Thilanka Dilshan
  • Updated October 7, 2026

Phishing remains the most common way into an organisation because it targets people, not systems.

Attackers use urgency, authority and familiar brands to get a click or a reply. AI tools have made convincing messages cheaper to produce.

Key points

  • Most breaches still involve a human step
  • Well-written phishing is now the norm
  • Layered controls work better than any single fix

How this guide is organised

The guide has 11 chapters. Each one stands on its own, so you can read them in order or go straight to the topic you need.

  1. The anatomy of a phishing email
  2. Business email compromise and invoice fraud
  3. Credential phishing and MFA fatigue attacks
  4. Email authentication: SPF, DKIM and DMARC
  5. Filtering, sandboxing and link protection
  6. Building a reporting culture
  7. Running phishing simulations that teach
  8. Payment verification processes for finance teams
  9. Responding to a reported phish
  10. Measuring awareness: metrics that matter

Who this guide is for

It is written for IT and security leads, risk and compliance owners and the managers who sign off on the work. This guide covers the attack, the technical controls and the human side.

Sources

All sources accessed 9 October 2026.

Thilanka Dilshan

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