Phishing endures because it targets people, not firewalls. A single convincing email can hand over a password or trigger a fraudulent payment. You will never make staff perfect, so the answer is layers that catch what slips through.
Layers that help
Filtering stops much of it before the inbox. MFA means a stolen password is not enough on its own. Clear payment-verification steps stop invoice fraud. And short, regular awareness training keeps people alert. Together these turn the occasional click from a crisis into a non-event.