<ul data-eligibleForWebStory="true">A new feature for Microsoft Defender for Office 365 will automatically send all identified email bombing messages to the junk folder.Most users are expected to receive this update by the end of July 2025.This feature aims to mitigate the dangers associated with email bombing, a malicious tactic where victims are inundated with a high volume of emails.The new 'Mail Bombing' detection capability will block these attacks by default, requiring no action from the user's side.