Abnormal AI protects companies against attacks that target people rather than systems: phishing, fake invoices, executive impersonation and stolen accounts. Instead of filtering mail at the gateway, it plugs into Microsoft 365 and Google Workspace by API and learns how each person normally communicates and signs in. It reports more than 4,500 customers, including 30% of the Fortune 500 as of September 2026. The company is headquartered in San Francisco, California.
Abnormal sells annual software subscriptions to organizations, most of them large enterprises. Its core product, Inbound Email Security, connects to Microsoft 365 or Google Workspace through APIs, builds a baseline of each user's normal behavior, and removes messages that deviate from it. Once installed, Abnormal sells additional products on the same platform: account takeover detection, AI Phishing Coach security training, AI Data Analyst reporting, Email DLP rules, Identity Threat Protection, AI Governance and AI Cloud Security. The company says three-fourths of its customers had moved away from a third-party secure email gateway by April 2025, which puts Abnormal in competition for the budget that used to go to gateway vendors. Resellers also carry the product; SoftBank Corp. began offering it to enterprise customers in Japan in September 2026.