check before: 2020-03-31
When a Reply-All mail storm happens in your organization it can disrupt business continuity and even cause unexpected throttling of your organization's mail flow within Office 365. While Exchange Online has several features designed to help prevent Reply-All storms (e.g. Distribution List (DL) allowed sender lists and recipient limits) that reduce the severity and impact of reply-all storms, they can still happen, especially if the DLs haven't been locked down tightly. Reply-All Storm Protection in Exchange Online will detect when a Reply-All storm is happening (or likely to happen) and will temporarily block users from replying to everyone on the thread. During this "cool down" period the service will send anyone who tries to reply to everyone a bounce message (or NDR) that effectively tells them to not try to reply all to the message. The temporary block will be active for several hours, usually enough time to dampen end-user enthusiasm to reply to the thread, and thus curtail the storm before it gets started or before it gains much momentum.
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