GCC DDG vs GCC DG

Ryan Broman 21 Reputation points
2022-12-23T21:37:41.25+00:00

Hello,

According to the MS documentation on Dynamic Distribution Groups, it says that government organizations calculate their DDG membership at the time that an email is delivered rather than nightly. Does this have any significant impact on the time it takes for mail to be delivered? Is there any metrics or side-by-side comparisons for government and non-government DDGs?

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Andy David - MVP 110.1K Reputation points Microsoft MVP
    2022-12-23T22:40:40.99+00:00

    Calculating based on the time the mail is sent is the traditional way of handling DDGs. I doubt there are metrics but the reality is that the old way is probably more accurate of membership, but on the other hand, calculating nightly is probably not a big deal for most orgs - especially if they know that membership will not be accurate for 24 hours.

    I would point out that you can still update a DDG manually in Exchange Online. From what I have seen, you dont need to wait 24 hours, you can do this after any change

    https://learn.microsoft.com/en-us/exchange/recipients-in-exchange-online/manage-dynamic-distribution-groups/view-group-members#refresh-the-membership-of-a-ddg

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  2. LilyLi2-MSFT 1,956 Reputation points
    2022-12-26T02:21:04.713+00:00

    Hi @Ryan Broman ,

    If the DDGs' member list is refreshed every 24 hours, the list of DDG members might become stale.

    For example, if a user has left a department that was used as a filter for the DDG, they might continue to receive mail that's sent to the DDG for the next 24 hours util the membership list is refreshed.

    However, government organizations may require greater security, so the membership lists of DDGs will be updated in real time.


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