Microsoft Technical Bulletins

The latest updates for all the Microsoft Products you use every day.

Written by Richard Quatier

My goal is to help your business by integrating processes that automate mundane tasks and simplify complex ones without breaking budgets.

Categories: Exchange Online

March 9, 2022

Blog Home

Feature update: Modern Dynamic Distribution Groups

Exchange Online, Microsoft 365 Experts

From Microsoft Corporation
Technical Bulletin MC340293 · Published Mar 8, 2022

Message Summary

We’re modernizing Dynamic Distribution Groups (DDGs) to bring you a more reliable, more predictable, and better performing experience. We’re making changes that will reduce mail delivery latency, improve service reliability, and allow you to see the members of a DDG. This rollout will provide the functionality to all Exchange Online organizations.

When this will happen:

We will begin rolling this out in early April and expect to complete by mid-April.

How this will affect your organization:

Today, the membership list for a Dynamic Distribution Group is calculated every time a message is sent to the group, based on filters and conditions that you have defined for that group. Since these filters can be highly complex, it can take a long time to calculate the recipient list, leading to delayed mail and in extreme cases, reliability issues. In addition to this, as DDGs are resolved only upon being sent, the actual recipient list is unknown to the sender, which can present potential compliance issues for our customers.

New changes:

  • Instead of calculating group membership in real time, we will be storing the membership list for each Dynamic Distribution Group. This membership list will then get updated periodically once every 24 hours.
    • Note: When you create a new Dynamic Distribution Group or modify the filters of a group, it may take up to 2 hours until your group is ready to be used for the first time after creating or modifying the group filters.


  • With this update, you will be certain of the recipient list of a Dynamic Distribution Group prior to a message being sent, which will help address any potential compliance concerns. You will have the capability to view Dynamic Distribution Group members via the Get-DynamicDistributionGroupMember cmdlet. For more information, please visit Get-DynamicDistributionGroupMember. In addition, by storing the calculated list of members on the Dynamic Distribution Group object, we will deliver messages more quickly and our service will have improved reliability.

What you need to do to prepare:

You don’t need to do anything since the functionality of Dynamic Distribution Groups remains the same. However, you may consider updating your user training, and notifying your helpdesk as there are behavioral changes involved. Since the membership list is no longer calculated each time, a message is sent, the recipient list may not always be up to date as it gets refreshed every 24 hours.

Additional information


QuixTec provides this and other technical bulletins unaltered from Microsoft. As an authorized Microsoft Partner, we ensure that all our solutions we deliver to you include the latest Microsoft updates.

ABOUT US: QuixTec, LLC is a U.S. certified Veteran Owned, modern DevOps organization and Microsoft Partner that specializes in Microsoft SharePoint, Microsoft365 expertise & HTML5 technologies for small to enterprise-sized organizations. The founder, Richard, has 30 years of experience working with several notable companies that include World Vision, Expedia, Microsoft, Levi Strauss, NASA, Boeing Aerospace, Los Alamos National Laboratory, and the U.S. Air Force, to name a few.  QuixTec is in the Seattle area. Phone today for a free consultation and project estimate:

(425) 367-9025


SharePoint Development ServicesSharePoint DevelopmentCustom Software DevelopmentMicrosoft 365 ExpertsMicrosoft 365IT Staffing ServicesIT StaffingWordPress Development ServicesSEO Services

You May Also Like…

Configuration Change in Name parameter for Exchange Online

Configuration Change in Name parameter for Exchange Online

Exchange Online, SharePoint Development Services From Microsoft CorporationTechnical Bulletin MC365786 · Published Apr 30, 2022 Action Required by May 31, 2022 Message Summary We're making some changes to the way Name parameter is being...

Turned-Off Basic Authentication – POP3

Turned-Off Basic Authentication – POP3

Exchange Online, Microsoft 365 Suite, Microsoft 365 Experts From Microsoft CorporationTechnical Bulletin MC359761 · Published Apr 16, 2022 Message Summary We are making some changes to improve the security of your tenant. We announced in...