Microsoft claims that the cloud-based email security suite Defender for Office 365 can now automatically detect and prevent email bombing attacks.
Defender for Office 365 (previously known as Office 365 Advanced Threat Protection or Office 365 ATP) guards organisations working in high-risk industries and dealing with sophisticated attackers from malicious threats delivered via email messages, links, or collaboration tools.
“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 notes in a Microsoft 365 message center update.
“This form of abuse floods mailboxes with high volumes of email to obscure important messages or overwhelm systems. The new ‘Mail Bombing’ detection will automatically identify and block these attacks, helping security teams maintain visibility into real threats.”
In late June 2025, the new ‘Mail Bombing’ feature began to roll out, and by late July, it should be available to all organisations. All messages detected as being a part of a mail bombing operati
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