Microsoft Now Blocks Reply-All Email Storms

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Microsoft is rolling out a new reply-all protection feature for Office 365 and Exchange Online.

This new feature is designed to prevent email storms when hundreds or thousands of people start replying to an email thread after someone forgets to BCC everyone or a distribution list was misconfigured. Something that has happened to everyone at least once – where for days on end, people are still replying to the thread “Please take me off CC.”

This new block feature is intended to benefit large organizations and is initially being rolled out to detect 10 reply-all emails to over 5000 recipients within 60 minutes.

“Over time, as we gather usage telemetry and customer feedback, we expect to tweak, fine-tune, and enhance the Reply All Storm Protection feature to make it even more valuable to a broader range of Office 365 customers,” explains Microsoft’s Exchange transport team.


Reply-all email storms are a problem that affects businesses large and small and have been occurring for decades, reports The Verge.

Microsoft had its own infamous incident in 1997, which employees fondly refer to as Bedlam DL3. Around 25,000 people were on a distribution list and kept replying to the thread, generating 15,000,000 email messages and 195 gigabytes of data. To halt something like this happening in the future, the company rolled out a message recipient limit in Exchange to try and tackle future problems.

Microsoft still suffers from reply-all email storms, though. Last year a GitHub notification triggered an email storm for thousands of Microsoft employees. Back in March, thousands of Microsoft employees were also caught in a reply-all email thread that was quickly shut down within 30 minutes.

Microsoft’s new reply-all email block feature will stay in place for four hours after it’s automatically triggered, enough time to stop people from asking “why am I on this email thread?” hundreds of times.

The block seems to already be working for Microsoft’s own employees. “Humans still behave like humans no matter which company they work for,” says the Exchange team. “We’re already seeing the first version of the feature successfully reduce the impact of reply-all storms within Microsoft.”

Edited by Luis Monzon

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