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Email Security Software · Rank #1 of 10

Abnormal Security

AI-driven behavioral anomaly detection, modern category leader for BEC, ATO, and vendor email compromise.

By Abnormal Security Corporation · Founded 2018 · San Francisco, CA · private

Abnormal Security is the modern AI-driven email security leader, founded 2018 by former Twitter and Pinterest engineers. The product is API-integrated (Microsoft Graph / Google Workspace) rather than gateway-inline, which lets it ingest the full identity and behavioral graph of the organization and detect anomalies that signature-based gateways consistently miss, particularly business email compromise, account takeover, and vendor email compromise. Closed a $250M Series D at a $5.1B valuation in 2024, with reported 2025 ARR over $300M. Best fit for enterprises (1,000-100,000+ employees) on Microsoft 365 or Google Workspace deploying alongside Defender for O365 or a legacy SEG as the AI-behavioral overlay layer. Trade-offs: priced as a premium overlay (does not replace your inline SEG/Defender for most buyers), pricing opaque and rising, and the company is still pre-IPO so financial transparency is limited.

Visit Abnormal Security Vendor pricing Compare to Proofpoint
Best for

Enterprises (1,000-100,000+ employees) on Microsoft 365 or Google Workspace adding an AI-behavioral overlay on top of Defender for O365 or a legacy SEG to catch BEC, ATO, and vendor email compromise.

Worst for

Cost-sensitive SMBs (Defender for Business or Microsoft 365 Business Premium cheaper), on-prem Exchange shops (unsupported), or buyers wanting a single replacement gateway rather than an additive overlay.

Vendor Trust Score

Is Abnormal Security a trustworthy vendor?

7.8/10
Mixed
Pricing transparency
Published rates; no hidden fees
5.5
Contract fairness
Reasonable terms; no auto-renew traps
7.0
Incident response
How they handle outages and breaches
8.5
Post-acquisition behavior
Customer treatment after M&A or PE
8.5
Executive stability
Leadership churn over 24 months
9.0
Roadmap honesty
Public commitments held
8.5
Trust signal log
  • 2024-08-08
    Series D raised $250M at $5.1B valuation; led by Wellington and CrowdStrike Falcon Fund
    Round confirmed market leadership in AI-behavioral email security
  • 2024-11-12
    CommSec for Slack, Teams, Zoom moved general availability
    Expansion beyond email into collaboration-channel BEC
  • 2025-04-22
    Renewal pricing increases of 15-25% reported by 2025 cohort
    Pattern flagged across multiple verified buyer disclosures
  • 2025-09-18
    Detection efficacy lead reaffirmed in independent SE Labs and Tolly testing for BEC/VEC
    Outperformed Proofpoint, Mimecast, and Defender for O365 on behavioral attack vectors
  • 2026-02-04
    IPO speculation surfaces in Bloomberg reporting; company declines to comment
    Filing not confirmed; market watching 2026-2027 window
Vendor Trust is scored independently of product quality. A great product from an unfair vendor still earns a low trust score.
Review Intelligence

What 1,340 reviews actually say

Synthesized from G2, Capterra, Reddit, Trustpilot. Patterns >15% prevalence shown.

Last synthesized
2026-04-30

Praise patterns

  • Catches BEC and vendor email compromise legacy SEGs consistently miss
    87% →
  • Account takeover detection genuinely effective in production
    78% ↑
  • API-integrated deployment took hours, not weeks
    71% →
  • Modern analyst UX with one-click cross-tenant remediation
    64% →
  • Strong product velocity and roadmap delivery
    51% →

Complaint patterns

  • Premium overlay pricing on top of existing Defender or SEG spend
    64% ↑
  • Pricing opaque and renewals jump 15-25%
    51% ↑
  • Per-module pricing makes the full bundle expensive
    47% ↑
  • Does not replace existing SEG; additive cost
    41% →
  • On-prem Exchange unsupported
    31% →
Sentiment trend (6 months)
89/100 +2 pts
12
01
02
03
04
05
Representative voices

  • “Caught two BEC attempts in our first month that Proofpoint had been waving through for years. The behavioral graph is the real product.”

    CISO, mid-market financial services· g2 · 2026-03-14

  • “Renewal came back 22% higher with no real justification. Brilliant product, painful procurement.”

    Director of Security, manufacturing· g2 · 2026-02-21

Patterns are extracted from review corpus and human-verified. We surface trends, not anecdotes.
Verified Pricing

What buyers actually pay

287 anonymized deal disclosures · last updated 2026-04-30

Contribute your deal price
Company size Median annual
500-2,500 mailboxes $54,000
2,500-10,000 mailboxes $192,000
10,000-50,000 mailboxes $720,000
50,000+ mailboxes $2,400,000
Listed-price history
2023
Inbound Email Security
$
+ $5.5/emp
2024
Inbound Email Security
$
+ $6.25/emp
2025
Inbound Email Security
$
+ $7.4/emp
2026
Inbound Email Security
$
+ $8.2/emp
Verified pricing is crowdsourced from buyers under anonymity guarantees. Vendor-listed prices are validated against actual deals quarterly.
Compliance & Security

Auto-verified certifications

Verified 2026-05-01
SOC 2 Type II
ISO 27001
HIPAA
GDPR
CCPA
PCI DSS
◐ FedRAMP In-Process

Editorial: Strengths

  • Strongest BEC and vendor email compromise detection in independent testing
  • API-integrated deployment (Microsoft Graph / Google Workspace), sees post-delivery context gateways miss
  • Behavioral identity graph models known-good sender/recipient relationships
  • Account takeover detection genuinely effective (mailbox sign-in anomalies, rule changes, forwarding)
  • Modern analyst UX, investigation timelines and one-click remediation across the tenant
  • Strong product velocity, quarterly capability releases since 2022

Editorial: Weaknesses

  • Premium overlay pricing ($5-$12/mailbox/month typical) on top of your existing Defender or SEG spend
  • Pricing opaque; channel-only disclosure
  • Does not replace inline SEG / Defender for most buyers, additive cost not substitutive
  • Rapid pricing escalation reported at renewal (15-25%) for 2025-2026 cohorts
  • Limited support for non-cloud mail (on-prem Exchange unsupported)
  • Detection beyond email (Slack, Teams, Zoom) still maturing

Key features & integrations

  • +API-integrated deployment via Microsoft Graph / Google Workspace
  • +Behavioral identity graph and known-good baseline modeling
  • +Business email compromise (BEC) detection
  • +Account takeover (ATO) detection, sign-in anomalies, rule and forwarding changes
  • +Vendor email compromise (VEC) detection, supplier impersonation
  • +Auto-remediation of malicious mail across the tenant
  • +Abuse mailbox automation and end-user reporting workflow
  • +CommSec for Slack, Microsoft Teams, Zoom (collaboration-channel BEC)
120+ integrations
Microsoft 365Google WorkspaceMicrosoft SentinelSplunkCrowdStrike FalconOkta
Geography supported
Global; strongest in US, EU, UK, AU
Best fit
500–100,000+ employees · Cloud-mail enterprises overlaying AI-behavioral on top of Defender or a legacy SEG
Editorial deep-dive

Read our full ranking of Email Security Software

Abnormal Security ranks #1 in our editorial review of 10 email security software platforms. The deep-dive covers methodology, comparison tables, decision matrix, migration scoring, and FAQs.

Read the full ranking

Closest alternatives in Email Security Software

#2
Proofpoint
Largest legacy enterprise SEG installed base; Tessian acquisition added behavioral AI.
★ 4.4 opaque
#3
Mimecast
Legacy SEG with mature archiving and awareness training bundle; PE-owned post-2022.
★ 4.4 opaque
#4
Microsoft Defender for Office 365
Bundled with M365 E5, the de facto default for Microsoft-anchored organizations.
★ 4.4 public
Help the next buyer

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