Microsoft Defender for Office 365, a cloud-based email safety suite, will automatically detect and stop email-bombing attacks, the company said. Previously known as Office 365 Advanced Threat Protection (Office 365 ATP), Defender for Office 365 safeguards businesses operating in high-risk sectors and dealing with advanced threat actors from harmful threats originating from emails, collaboration tools, and links.
“We’re introducing a new detection capability in Microsoft Defender for Office 365 to help protect your organization from a growing threat known as email bombing,” Redmond said in a Microsoft 365 message center update. These attacks flood mailboxes with emails to hide important messages and crash systems. The latest ‘Mail Bombing’ identification will spot and block such attempts, increasing visibility for real threats.
About the new feature
The latest feature was rolled out in June 2025, toggled as default, and would not require manual configuration. Mail Bombing will automatically send all suspicious texts to the Junk folder. It is now available for security analysts and admins in Threat Explorer, Advanced Hunting, the Email entity page, the Email summary panel, and the Email entity page.
About email bombing atta
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