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KnowBe4 Defend secured the top rank across every threat uplift metric in the latest email security benchmarking assessment from cybersecurity engineers at Microsoft. The evaluation evaluated real production customer telemetry between May and July 2026. Data revealed that the product identified 3.7 times more malicious emails that bypassed Microsoft Defender compared to the field average for cloud security add-ons.
Benchmark Results for KnowBe4 Defend
The benchmark tested seven integrated cloud email security tools installed alongside native defenses. KnowBe4 Defend intercepted 1.11% of dangerous messages missed by the primary filter, while the overall field average stood at 0.30%. The software also demonstrated a 0.65% overlap rate with native filters, representing the lowest duplication level recorded in the report.
Remediation metrics showed notable results after initial message delivery. The tool executed 16.92% of post-delivery threat removals across protected mailboxes. This outcome doubled the industry average of 8.00% recorded during the evaluation window.
Handling Evasive Email Threats
Modern attack vectors increasingly use payload-free techniques rather than malicious attachments. Criminals rely on business email compromise, executive impersonation, and synthetic messaging created through artificial intelligence platforms. These formats do not contain traditional infected links, requiring behavioral analysis tools to detect suspicious conversational patterns.
The system connects via Graph APIs or pre-delivery inline routing to inspect inbound traffic. While Microsoft Defender processes standard perimeter volumes, the add-on monitors internal channels and conversational irregularities. Protection also extends to messages moving into communication tools within common productivity software suites.
Productivity and Message Filtering
Administrative filtering showed distinct efficiency gains in user environments. KnowBe4 Defend took first position in spam uplift with a 1.88% capture rate. It also cleared 65.24% of graymail and marketing messages, reducing manual sorting requirements for network administrators.
As a charter participant in the Microsoft email vendor program, KnowBe4 structured the tool to run directly within production tenants. Stuart Clark, Senior Vice President of Product at the company, plans to review the technical details during an analytical presentation on October 28. Clark will demonstrate live threat-hunting workflows using standard query languages.
Outlook for Enterprise Email Security
Organizations face ongoing operational challenges from identity-based messaging intrusions. Native perimeter defenses filter common threats, but secondary behavioral analysis is increasingly necessary for targeted deception. Independent testing using real tenant telemetry offers administrators objective performance figures to support security procurement decisions.
