9 Must-Know Best Practices for Email Security
KnowBe4, Monday, March 9th, 2026
More than 90% of successful cyberattacks start with email, according to the U.S. Cybersecurity and Infrastructure Security Agency (CISA). That's not because security teams lack tools, but because attackers target human decision-making.
For years, organizations treated email security as a filtering problem: block enough malicious messages, and risk goes down. That assumption no longer holds.
Modern phishing, business email compromise (BEC), and impersonation attacks are designed to bypass technical controls by looking legitimate, arriving at the right moment, and pressuring employees to act quickly.
When email attacks succeed today, it's rarely because a control failed. It's because a message reached a person who was persuaded to click, reply, or comply.