Abnormal Security takes a fundamentally different approach to email security. Instead of scanning for known malware signatures or suspicious links, the platform builds behavioral profiles of every person and organization that communicates via email, then flags messages that deviate from established patterns. Founded in 2018 in San Francisco by Evan Reiser and Sanjay Jeyakumar, the company was purpose-built to catch the attacks that traditional email gateways miss — particularly business email compromise, vendor fraud, and sophisticated phishing campaigns.
The platform’s AI engine analyzes thousands of signals including writing style, communication patterns, relationship graphs, and business context to determine whether an email is legitimate. When the CFO’s email account suddenly sends a wire transfer request with slightly different phrasing at an unusual hour, Abnormal catches it. The company also provides security posture management for cloud email platforms and automated remediation that can pull malicious messages from inboxes across an organization in seconds.
Abnormal Security has raised over $280 million in funding and reached a valuation of approximately $4 billion. The company has grown at a remarkable pace, reaching over 1,800 customers including many Fortune 500 companies. Business email compromise remains the most financially devastating form of cybercrime — the FBI estimates it caused over $2.7 billion in losses in 2022 alone — and that persistent threat drives strong demand for Abnormal’s behavioral detection capabilities. The company’s API-based deployment model means customers can get up and running without changing their email infrastructure.
