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Best AI-Powered Email Security Alternatives to Proofpoint in 2026

AI-powered email security platforms use machine learning, behavioral analysis, and natural language processing to detect email threats that traditional signature-based gateways miss.

3 AI-Powered Email Security Platforms, side by side

ToolDeploymentPricing modelOpen source
Abnormal AICloudPer-user subscription—
IRONSCALESCloudPer-user subscription (tiered plans)—
TessianCloudPer-user subscription—

These tools excel at catching socially-engineered attacks like business email compromise, vendor fraud, and account takeover where there is no malicious payload for conventional scanners to detect. They typically deploy via API without MX record changes and can layer on top of existing email security gateways for defense-in-depth.

By use case

Our read on which tool suits which job. Editorial, not paid, and separate from the listing below.

Organizations facing sophisticated social engineering and BEC attacks that bypass traditional email gateways

Abnormal AI

The strongest AI-powered email security platform with behavioral detection that catches BEC and social engineering attacks that gateway solutions miss. Best for organizations facing sophisticated impersonation and vendor fraud attacks, typically deployed as a supplementary layer behind an existing gateway.

Cloud

Mid-market organizations wanting automated phishing protection with integrated security awareness and phishing simulation

IRONSCALES

Combines AI-powered phishing detection with crowdsourced threat intelligence and integrated phishing simulation training. Best for mid-market organizations wanting a focused anti-phishing solution with built-in security awareness at accessible pricing.

Cloud

Organizations concerned about both inbound email threats and accidental data loss from misdirected emails and human error

Tessian

Uniquely addresses both inbound threats and outbound data loss from misdirected emails and human error. Best for organizations where accidental data loss through wrong recipients is a significant risk alongside inbound phishing threats. Now part of Proofpoint following acquisition.

Cloud

Abnormal AI

Email Security
Best fit for

Organizations facing sophisticated social engineering and BEC attacks that bypass traditional email gateways

Abnormal AI, known as Abnormal Security until April 2025, is an AI-native email security platform that uses behavioral AI to detect and block socially-engineered email attacks that bypass traditional email security gateways. Rather than relying on signatures, threat feeds, or URL scanning, Abnormal builds behavioral profiles of every identity in the organization and detects anomalies in communication patterns, writing style, and email metadata. This approach is particularly effective against business email compromise, vendor fraud, and account takeover attacks that contain no malicious payloads for traditional tools to catch.

Pricing

Pricing is not published. The site offers a demo request.

Per-user subscription

Deployment

Cloud

Standards & certifications

SOC 2 Type II, ISO 27001, ISO 27701, ISO 42001, CSA STAR, FedRAMP Moderate, GovRAMP, TX-RAMP, Cyber Essentials Plus

Visit Abnormal AIView listing

IRONSCALES

Email Security
Best fit for

Mid-market organizations wanting automated phishing protection with integrated security awareness and phishing simulation

IRONSCALES is an AI-powered anti-phishing and email security platform that combines automated threat detection with crowdsourced human intelligence from security analysts across its customer base. Its platform uses computer vision, natural language processing, and behavioral analysis to detect phishing, BEC, and account takeover attacks. IRONSCALES differentiates with its decentralized threat intelligence model where analyst decisions on phishing reports from one organization automatically protect all customers, and its focus on making email security accessible to organizations without large security teams.

Pricing

See the vendor site for current pricing.

Per-user subscription (tiered plans)

Deployment

Cloud

Standards & certifications

ISO 27001, SOC 2 Type II

Visit IRONSCALESView listing

Tessian

Email Security
Best fit for

Organizations concerned about both inbound email threats and accidental data loss from misdirected emails and human error

Tessian (now part of Proofpoint following acquisition) is a human layer security platform that uses machine learning to protect against inbound email threats and prevent outbound data loss caused by human error. Its AI engine analyzes email communication patterns to detect phishing, BEC, account takeover, and misdirected emails. Where users accidentally send sensitive data to the wrong recipient. Tessian's unique strength is its ability to prevent accidental data loss alongside inbound threat protection, addressing the human risk layer that traditional gateways miss.

Pricing

Custom pricing / per-user licensing

Per-user subscription

Deployment

Cloud

Visit TessianView listing

Comparisons

Proofpoint vs Tessian

Choose Tessian if preventing misdirected emails and accidental data loss is a critical requirement that your current ema...

Read Comparison

Abnormal AI vs Cisco Secure Email

Choose Abnormal Security if strong detection of socially-engineered attacks with no malicious payload is your priority a...

Read Comparison

Abnormal AI vs Mimecast

Choose Abnormal Security if strong detection of socially-engineered attacks with no malicious payload is your priority a...

Read Comparison

Abnormal AI vs Trend Micro Email Security

Choose Abnormal Security if strong detection of socially-engineered attacks with no malicious payload is your priority a...

Read Comparison

Abnormal AI vs Barracuda Email Security

Choose Abnormal Security if strong detection of socially-engineered attacks with no malicious payload is your priority a...

Read Comparison

Abnormal AI vs IRONSCALES

Choose Abnormal Security if strong detection of socially-engineered attacks with no malicious payload is your priority a...

Read Comparison

Shortlists

Editorial lists and deep dives covering these tools.

Frequently Asked Questions

Not entirely. AI-powered email security tools like Abnormal Security and IRONSCALES excel at detecting socially-engineered attacks that lack malicious payloads, but they do not provide the full feature set of a secure email gateway. They do not handle email routing, spam filtering, malware sandboxing, email archiving, or compliance. Most organizations deploy AI email security as a supplementary layer behind Proofpoint or another gateway, creating defense-in-depth where the gateway handles payload-based threats and the AI layer catches social engineering.

Proofpoint primarily operates as a secure email gateway that inspects content, URLs, and attachments using signatures, sandboxing, and threat intelligence. AI email security platforms like Abnormal Security take a fundamentally different approach by building behavioral profiles of every user and detecting anomalies in communication patterns, writing style, and email metadata. This behavioral approach catches attacks where there is no malicious content to scan, such as a CEO impersonation email asking for a wire transfer using only plain text.

For organizations facing significant BEC and social engineering threats, yes. Business email compromise caused over $2.9 billion in reported losses in 2023, and these attacks are specifically designed to bypass gateway detection. Abnormal Security catches BEC attacks that Proofpoint misses because they contain no malicious payload. Just persuasive social engineering. If your organization regularly sees executive impersonation, vendor fraud, or invoice manipulation attempts, adding Abnormal Security provides meaningful additional protection.

Proofpoint acquired Tessian to integrate its human layer security technology. Particularly misdirected email prevention and behavioral data loss detection. Into the Proofpoint platform. Tessian's standalone product continues to operate but its long-term future as an independent offering is uncertain. Organizations evaluating Tessian should consider whether its capabilities will eventually be available natively within Proofpoint, which could eliminate the need for a separate tool.

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About this listing

AI-Powered Email Security Platforms tools, compared on public information. The comparison table and the full entries follow our editorial order, with any paid Featured listing shown first and labelled. How we work →