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Microsoft adds protection against Reply-to-all email storms to Office 365

"Reply-to-all storms" can disrupt business continuity and in some cases even cripple your organization's entire email environment for a period of time. At Microsoft Ignite 2019, Microsoft announced in advance the "Reply All Storm" Protection feature to reduce the impact that all email storms can have on large organizations.

It was announced on Thursday that Microsoft is now rolling out this feature globally in Office 365. From 10 reply to anyone on a scale of 5000 people within the hour (60 minutes) you will get the notification below.


EOP - Exchange Online Protection

Exchange Online Protection (EOP) is the cloud-based filtering service that helps protect your organization from spam and malware. EOP is included in all Microsoft 365 organizations with Exchange Online mailboxes.

EOP is available in the following 2 scenarios:

  • In a standalone scenario, EOP provides cloud-based email security for your on-premises Exchange organization or for any other on-premises SMTP email solution.
  • In a hybrid deployment: EOP can be configured to protect your email environment and handle email routing when you have a mix of on-premises and cloud mailboxes.

In these scenarios, EOP can simplify the management of your e-mail environment and ease many of the burdens associated with maintaining on-premises hardware and software. The rest of this topic explains how EOP works in standalone and hybrid environments.


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