Microsoft is strengthening its cybersecurity arsenal with the introduction of Mail Bombing Detection in Microsoft Defender for Office 365, a sophisticated feature designed to combat the growing threat of email bombing attacks. The new detection type appears prominently in Threat Explorer, Email entity view, Email Summary Panel, and Advanced Hunting capabilities, providing security teams with detailed forensic data and threat intelligence. This automated defense mechanism, rolling out globally from late June through early July 2025, represents a significant advancement in email security infrastructure, providing organizations with enhanced protection against high-volume email floods that can obscure critical communications and overwhelm system resources. We have already notified the implementation of Microsoft Defender for Office 365, which will introduce advanced measures to mitigate email bombing attacks. The feature integrates seamlessly with existing email processing workflows, introducing new detection logic that enhances rather than disrupts current security protocols. The system modifies email message classification and routing processes, potentially affecting Purview capabilities, including audit logging and eDiscovery visibility for messages redirected to Junk folders. Microsoft Defender for Office 365 adds Mail Bombing Detection, rolling out globally in June-July 2025. The system intelligently processes incoming email streams, analyzing patterns and volumes to distinguish legitimate communications from malicious bombing attempts. Automatically blocks email bombing attacks and sends them to the Junk folder without manual setup. Teams can monitor threats through Threat Explorer, Email entity view, and Advanced Hunting tools. When activated, the detection engine automatically routes identified mail-bombing messages to the Junk folder, while maintaining respect for existing Safe Senders settings.
This Cyber News was published on cybersecuritynews.com. Publication date: Wed, 02 Jul 2025 14:15:16 +0000