Abnormal AI

Overview

Abnormal was founded in 2018 by Evan Reiser and colleagues from the advertising-technology industry, and says more than 30% of the Fortune 500 use it^[7]. Its platform page cites 5,000 organisations as customers^[8]. Abnormal takes an API-based, behavioural approach to email security: rather than sitting in the mail flow, it connects to Microsoft 365 or Google Workspace through APIs, which the company says takes 60 seconds and requires no MX changes, and learns normal communication patterns in order to flag deviations^[8]. Its Behavior Engine and the Attune 1.0 model are trained on behavioural signals rather than signatures. Email products include Inbound Email Security, an AI Security Mailbox for user-reported messages, AI Phishing Coach, email productivity filtering, misdirected email and DLP rules; identity products include account takeover protection; and the company now also sells AI security modules for governing AI agents and employee AI use^[8]. The platform lists more than 100 native API integrations. Limitations: there is no pre-delivery gateway, so some messages reach the mailbox before removal, and pricing is not published^[8].

Abnormal AI features

• API deployment with no MX changes
• Behavioural anomaly detection
• Account takeover protection
• AI Security Mailbox for user reports
• AI Phishing Coach
• AI agent and employee AI guardrails

Abnormal AI pricing

Not published on the platform page; quote-based.

Abnormal AI strengths and limitations

Appears in

• Best Email Security Solutions in 2026 #4

Abnormal AI alternatives and competitors

Alternatives to Abnormal AI: companies ranked in the same lists.

• Proofpoint Core Email Protection
• Microsoft Power BI
• Mimecast
• Check Point Software Technologies
• Darktrace / EMAIL
• CSCisco Secure Client
• Barracuda Email Protection
• Hornetsecurity VM Backup
• SXSophos XDR
• IRONSCALES
• Fortinet
• Material Security