Abnormal Security

Abnormal Security uses behavioral AI to detect email threats that traditional gateway filters miss. Instead of relying on known signatures or rules, it builds a baseline of normal communication patterns for every person in your organization and flags anomalies — unusual sender behavior, suspicious requests, impersonation attempts, and social engineering tactics. The platform is particularly effective against business email compromise (BEC) attacks, which are the most financially damaging form of email fraud. It also handles vendor email compromise, where attackers hijack real vendor accounts to send fraudulent invoices or payment change requests. Abnormal integrates with Microsoft 365 and Google Workspace via API, deploying in minutes without changing mail routing. The AI improves over time as it learns more about your organization's communication patterns. Pricing is custom and based on mailbox count.