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Understanding the competition

Abnormal AI vs. Mimecast

Abnormal is designed to analyze inbound email via API integration, ensuring broad behavioral analysis coverage across your email traffic.

The Result

Comprehensive Behavioral AI Protection

Traditional Approaches Only Catch Traditional Threats

Modern email attacks rarely contain known-bad indicators of compromise that traditional threat detection relies on. Instead, cybercriminals are exploiting trust, legitimate infrastructure, and security blind spots through socially engineered attacks. Abnormal has witnessed threat actors:

  • Use QR codes and social engineering, not payloads.
  • Launch attacks from compromised internal and vendor accounts.
  • Abuse OAuth tokens and bypass MFA.

Abnormal Protects Customers Using Behavioral AI

Our Behavioral AI works by:

  • Analyzing every single post-SEG email along with over 50,000 behavioral signals.
  • Our contextually rich analysis thoroughly models each account’s and vendor’s behavior.
  • As a result, we detect the most subtle anomalies that signal an advanced, IOC-free socially engineered attack.

Mimecast’s Behavioral Analysis Uses A Narrow Scope

Mimecast claims to offer behavioral analysis—but their approach is fundamentally different:

  • They begin by scanning messages using static rules and know-bad threat signatures.
  • Next, they apply Natural Language Processing to the subset of messages flagged as anomalous.
  • This limits coverage and increases the risk of missing sophisticated threats like account takeovers and vendor compromises.
Source

Read more about how Abnormal detected invoice and vendor fraud attempts that Mimecast missed.

Abnormal’s Advanced Protection

VIP and Internal Employee Impersonation (Without Payloads)

Abnormal is designed to detect and remediate these attacks by:

  • Baseline modeling of every account's normal communication behavior.
  • Using NLP and Behavioral AI to detect tone, urgency, and role-based anomalies.
  • Fully automated detection and remediation across all messages.
Mimecast’s Natural Language Processing only analyzes messages flagged by CyberGraph, meaning most emails—especially from known senders—aren’t scanned, limiting detection of payload-less impersonation attacks.

One-to-One Spear Phishing (New Senders, No Payloads)

Abnormal is designed to detect these attacks through:

  • Behavioral context, such as a never-before-seen sender.
  • Identification of unexpected communication patterns.
  • NLP-based detection of urgency, financial intent, or manipulation.
Mimecast's rule-based and NLP-layered detection may be less effective in detecting payload-less, socially engineered attacks due to its reliance on known-bad IOCs, domain reputation, and rule-based filtering—none of which provide the contextual understanding needed to catch advanced threats.

How Abnormal Delivers on Key Customer Needs Compared to Mimecast

Value

Mimecast SEG

Mimecast Cloud Integrated (CI)

Abnormal AI

Onboarding

Mimecast SEG

Typically multi-week setup with PS assistance

Mimecast Cloud Integrated (CI)

Typically 30-60 minutes setup (basic transport rules)

Abnormal AI

Deploys typically in under 30 seconds via API

Threat Detection

Mimecast SEG

Static rules, reputation checks, malware scans

Mimecast Cloud Integrated (CI)

Same engines as SEG; NLP applied post-CyberGraph

Abnormal AI

Behavioral AI is designed to analyze 100% of messages against dynamic user/vendor baselines

ATO Protection

Mimecast SEG

Limited; no identity signal integration

Mimecast Cloud Integrated (CI)

No detection of login anomalies or MFA changes

Abnormal AI

Behavioral AI helps detect and remediate ATOs

VEC Protection

Mimecast SEG

Spoofed domain detection via DMARC

Mimecast Cloud Integrated (CI)

Header analysis only; lacks behavioral insight

Abnormal AI

Detects compromised vendors with VendorBase™ across 3,000+ orgs

Maintenance

Mimecast SEG

Requires ongoing policy tuning

Mimecast Cloud Integrated (CI)

Minimal tuning, limited configuration

Abnormal AI

Self-learning; no rule-writing or tuning required

The Results Speak for Themselves

Win Rate

Abnormal is frequently chosen in head to head evaluations against Mimecast.

Time To Value

Deploys in minutes, no configuration needed

3,000+

Protects over 3,000 organizations, including more than 22% of the Fortune 500
Discover How It All Works

See How Abnormal AI Protects Humans

DISCLAIMER: The foregoing is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Abnormal AI’s products remains at the sole discretion of Abnormal AI and is subject to change. The comparative statements are based on publicly available information as of May, 2025 and may not reflect the most current configurations or features.