Reply-Chain Hijack

How Threat Intelligence Strengthens Email Security

June 19, 2026 / in Blog / by Zafar Khan, RPost CEO

Security Teams Get Earlier Warning Signs of Phishing, Impersonation, Account Compromise, & Invoice Fraud.

Threat intelligence often has a slightly glamorous (and serious) association with spying and national security activities. In email security, however, it’s slightly unglamorous; mostly involving the use of threat data, behavioral signals, sender context, domain reputation, message patterns, and recipient activity to judge whether an email is safe, suspicious, or dangerous.