Microsoft Exchange Online: MAJOR UPDATE – New limit for dynamic distribution groups (DDGs)

Hi All,

Greetings for the day!!!

Today sharing one of the MAJOR UPDATE related to Microsoft Exchange Online.

MAJOR UPDATE – Microsoft Exchange Online will limit dynamic distribution groups (DDGs) to 3,000 per organization starting in April 2025.

Details

• Microsoft Exchange Online will limit dynamic distribution groups (DDGs) to 3,000 per organization starting in April 2025.
• Admins must remove existing DDGs to create new ones if the limit is reached.
• This change is automatic and can’t be turned off.
• If our organization has fewer than 3,000 DDGs, this change will not impact us. 

When this will happen:

• General Availability (Worldwide, GCC): This limit will be enforced in early April 2025.

Microsoft Recommendation

• Review the usage of Dynamic Distribution Groups (DDGs) in our organization and remove any DDGs that are no longer needed.
• We can use the Dynamic distribution groups report in the Exchange admin center (EAC). It allows us to see the number of DDGs in our organization. It also provides insights into their usage.
• To access this report, go to the EAC > Reports > Mail flow > Dynamic distribution group report.

Permissions needed to view mail flow reports in Exchange admin center

To view and use mail flow reports, you need to be a member of one of the following role groups in Exchange Online:

• Compliance Administrator
• Exchange Administrator
• Organization Management
• Security Administrator
• Security Reader
• View-Only Recipients

REFERENCES

• Small Tips and Tricks – Exchange admin center – How to navigate to Exchange admin center – https://knowledge-junction.in/2023/02/06/small-tips-and-tricks-exchange-admin-center-how-to-navigate-to-exchange-admin-center/
• Microsoft 365: Creating security group from UI – in Microsoft 365 admin center – https://knowledge-junction.in/2022/11/30/microsoft-365-creating-security-group-from-ui-in-microsoft-365-admin-center/
• Microsoft 365 administration : Microsoft 365 groups – Interview preparation – https://knowledge-junction.in/2025/02/01/m365-administration-groups-interview-preparation/

Thank you for reading!

Have a nice day 🙂 LIFE IS BEAUTIFUL:)