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threat intel
Improving email security outcomes with real-world Microsoft Defender insights
Microsoft published its fifth consecutive quarterly email security benchmark comparing Microsoft Defender with competitors from May through July 2026. The report found Defender missed 55% fewer high-severity threats per 1,000 users than the next-closest vendor, and caught 92% of post-delivery malicious messages through a combination of pre-delivery filtering and continuous post-delivery threat reevaluation. Missed threats increased across the industry as artificial intelligence (AI) enables more convincing phishing attempts, prompting Microsoft to invest in improved machine learning models, promotional email filtering, and prompt injection protection.
Why it matters: Security teams evaluating email protection need current benchmark data on detection gaps and post-delivery remediation effectiveness; Microsoft's report reveals that continuous threat reevaluation after delivery, not just pre-delivery filtering, significantly improves malicious email catch rates.
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- First seen by Cybersecurity Tracker