Microsoft blocks reply-all mail feature due to inbox spamming
Microsoft started rolling out a new reply-all mail protection feature for Office 365 and Exchange Online customers.
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.
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.
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.
The company also said that the first version of this feature has reduced the impact of reply all storms within Microsoft.