BEC is an organized business model with specialized division of labor that demands comprehensive technical and procedural countermeasures rather than point-in-time email filtering.
Microsoft’s benchmarking shows only marginal added value (under 0.05%) for additional email security tools, but experts emphasize that a percentage figure does not reveal the full risk picture and a single missed threat can be critical.
Age-based reputation scoring in mail filters became a critical vulnerability because attackers acquire legitimate, long-clean domains and repurpose them for phishing.
A security vulnerability in Exchange Online allows email sender spoofing under certain conditions, facilitating phishing and social engineering attacks.
