<p>Microsoft started rolling out a new <a href="https://techcommunity.microsoft.com/t5/exchange-team-blog/reply-all-storm-protection-in-exchange-online/ba-p/1369811" target="_blank" rel="noopener noreferrer">reply-all mail protection feature</a> for Office 365 and Exchange Online customers.</p>
<p><img class="alignnone wp-image-3681 size-full" title="reply-all mail feature" src="https://www.wincert.net/wp-content/uploads/2020/05/reply-all-microsoft.jpg" alt="" width="645" height="600" /></p>
<p>A reply-all protection feature should protect O365 and Exchange Online customers from Inbox wreckage when thousands of users start to use the reply-all option in a misconfigured distribution list. The new feature will automatically detect when 10 replies to all were made within 60 minutes in a 5000+ recipients conversation.</p>
<p>Microsoft plans to fine tweak and improve this feature over time making it even more valuable to a broader range of O365 customers. For that purpose, the company will use telemetry and customer feedback to gather valuable data.</p>
<p>Reply-all mail problem causes headaches to both small and large businesses and even Microsoft felt it back in 1997 when 25k people on a distribution list started using the reply-all feature and have generated 15 million messages and 195GB of data.</p>
<p>The company also said that the first version of this feature has reduced the impact of reply all storms within Microsoft.</p>

Microsoft blocks reply-all mail feature due to inbox spamming
