Best AI Phishing Detection Tools in 2026: 8 Tools Compared

Abnormal AI is our pick for teams whose main risk is business email compromise. Instead of relying only on links and attachments, it builds a behavioral profile for each identity and flags messages that break normal patterns, such as a supplier suddenly asking for a payment change. That approach helps with payload-free attacks that traditional gateways often miss.

Abnormal deploys through an API, so mail does not need to be rerouted through a gateway, and it can sit alongside an existing gateway or native Microsoft protection. Pricing is quote-based, and estimates vary widely by tier and seat count, so get a written quote for your mailbox count. For Microsoft 365 shops with high BEC risk, Abnormal is the strongest specialist choice here.

Microsoft Defender for Office 365 is the natural choice for teams already on Microsoft 365. Plan 1 starts at $2 per user per month, with higher plans adding automated investigation and response, threat trackers, and attack simulation. Because it is native, it links with Exchange, Teams, SharePoint, and identity tools without a separate gateway.

The trade-off is ecosystem fit. Defender works best inside Microsoft 365, and teams on Google Workspace or mixed email systems may prefer a gateway or API tool. For Microsoft shops that want solid AI-assisted phishing protection without adding a new vendor, Defender is a practical first layer, and it pairs well with a specialist tool such as Abnormal for BEC.

Proofpoint offers a broad email security suite, including threat protection, URL defense, attachment sandboxing, data loss prevention, encryption, and continuity. Its AI and machine learning tools help catch impersonation and targeted phishing, while its gateway approach suits complex, hybrid, or multi-platform email setups.

Pricing is quote-based and depends on modules and seat count, and the full suite can be complex for small teams. Proofpoint Essentials offers a simpler entry point for Microsoft 365 shops, with a lower starting price reported in public comparisons. For large or compliance-heavy organizations that need one broad suite, Proofpoint remains a leading choice.

Mimecast pairs email security with continuity and archiving, which appeals to organizations that need mail to keep working during an outage and must retain messages for compliance. Its security tools include impersonation protection, URL and attachment checks, and AI-assisted detection, with deployment options for Microsoft 365, Google Workspace, and hybrid setups.

Pricing is quote-based, and the full suite can be more than a small team needs. For organizations that value continuity and archiving alongside phishing protection, Mimecast offers a strong combined package. Check which modules are included in any quote, since archiving and continuity are often separate from core security.

IRONSCALES focuses on phishing and business email compromise, with mailbox-level AI that learns from user reports. When a user reports a message, the system can pull similar messages from other mailboxes automatically, which reduces manual cleanup. Built-in phishing simulations and training help staff recognize real attacks, which is a useful second layer.

Pricing is quote-based, with public comparisons reporting a starting point around $6 per user per month in some cases, so confirm your quote directly. Spam filtering is weaker than its phishing detection, so some teams pair it with another filter. For mid-size teams that want phishing depth plus training, IRONSCALES is a strong pick.

Material Security offers cloud-native protection for Microsoft 365 and Google Workspace, with a starting price of $4 per user per month on annual billing in public comparisons. Its focus includes phishing, business email compromise, and account takeover, with API-based deployment that avoids mail rerouting.

The suite is narrower than Proofpoint or Mimecast, so teams that need archiving, continuity, or broad data loss prevention may need another tool. For cloud email teams that want a clear price and a focused phishing and takeover defense, Material Security is worth a trial.

Check Point Harmony Email, formerly Avanan, protects email and collaboration tools such as Microsoft Teams, Slack, and file-sharing apps, not only inboxes. That breadth matters when phishing moves beyond email into chat and shared files. API-based deployment lets it scan messages after native filters, catching threats that slip through a first layer.

Pricing is quote-based, with public comparisons reporting a starting point around $4 per user per month in some cases. Setup across many apps takes planning, and small teams may prefer a narrower tool. For organizations that need phishing protection across email and collaboration apps, Harmony Email offers a broad option.

Sublime Security stands out for transparency. Its detection rules are open, so security teams can see, test, and customize how messages are flagged, rather than trusting a closed AI model alone. That openness suits detection engineers and teams that want to write their own rules for their specific threats.

Sublime also offers AI-assisted detection alongside its rule engine, with API-based deployment for Microsoft 365 and Google Workspace. Pricing is quote-based, and public comparisons report a lower starting range than some enterprise suites. For technical teams that value control and visibility, Sublime is a strong specialist choice.