Email security is a system
No filter can perfectly identify every malicious message without also blocking legitimate business communication. Effective defence combines technical inspection with identity controls and clear business processes.
Core layers
- SPF, DKIM and DMARC for domain authentication
- Impersonation and display-name protection
- Attachment and URL analysis
- External sender marking and user reporting
- Verification of bank-detail and payment changes
Measure useful outcomes
Track reported messages, repeated themes, quarantine release quality and the time from report to investigation. Avoid using phishing simulations simply to blame individuals. They should improve confidence and reinforce the process for asking for help.