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The Reply-all Storm Protection feature in Exchange Online helps protect your organization from unwanted and disruptive reply-all storms. Last year we updated the feature to give admins the ability to customize key settings for reply-all storm detection and block duration, and in that announcement we noted that several additional updates were planned for a future date. We’re pleased to announce that we’re rolling out three updates:
- A Reply-all Storm Protection Report to track reply-all storms and the messages blocked by the feature.
- The ability to customize feature settings within the EAC (in addition to Remote PowerShell).
- A mail flow system alert policy to notify admins when a reply-all storm hits your organization.
The report includes charts for detected reply-all storms and associated blocked messages, and a pop-out storm details panel available when you click on a storm name at the bottom of each chart. additional details about each storm, it also includes a CSV-exportable table with key details of each storm such as subject, original message, total messages, and message ID. The report is available in the new EAC under the Reports > Mail flow section. Here’s a sample report:
Roll-out of the report starts this week and should finish by the end of May for the WW environments (including GCC), with availability in the GCC-High environment expected by the end of July. More information about the report can be found in Reply-all storm protection report in the new EAC in Exchange Online.
It’s been possible to customize key settings for the Reply-all storm protection feature using Remote PowerShell for over a year. Today, we’re happy to announce that you can now also customize these settings in the new EAC under the Settings > Mail flow panel, available now, as shown below:
To change these settings, you must have permission to change Transport configuration information (e.g., Set-TransportConfig) as part of the Organization Transport Settings role group (and included as part of the Exchange Admin and Global Admin roles).
Lastly, we’re currently working on a mail flow system alert policy that will notify admins when a reply-all storm has been detected and at least one reply-all has been blocked. Like all mail flow alerts it will be customizable so you can configure who gets notified and other common alert parameters. When the Reply-all Storm Protection alert policy is release (by the end of July) it will appear in the Mail flow > Alert policies section of the new EAC.
We hope you find these new updates for the Reply-all Storm Protection feature useful, and we look forward to any feedback or suggestions for future updates you might have.
Brought to you by Dr. Ware, Microsoft Office 365 Silver Partner, Charleston SC.