Moderated Distribution lists and Allowed senders

Alex C 56 Reputation points
2020-12-26T17:43:25.723+00:00

We have some nested distribution groups in Office 365 with the top group requiring moderation and some child groups only allowing messages from allowed senders. Example:

  1. Company-All group requires moderation (Bob and Jane), allows messages from all senders, and has a bunch of child groups
  2. Department-Finance group is a member of Company-All, does not require moderation, but only allows certain senders (Bob, Jane, and Mary)

Ed recently sent a message to Company-All. One of the moderators (I'm not sure who) approved the email. Everyone in the company received it, including Department-Finance.

Any idea how this is possible since only Bob, Jane, and Mary are allowed to send to Department-Finance? Is it possible that because Bob or Jane approved the message, Exchange Online saw them as the sender and thus allowed it through? I checked the internet headers and the only sender is Ed.

Thanks.

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. KyleXu-MSFT 26,206 Reputation points
    2020-12-28T03:04:33.037+00:00

    @AlexCarlock-4833

    I did the testing in my lab and get a different result which looks more logical:

    Group1 :
    51399-qa-kyle-10-41-27.png

    Group2:
    51406-qa-kyle-10-42-38.png

    Then Admin sends email to group1, User C.C approve this email:
    51400-qa-kyle-10-56-43.png
    51531-qa-kyle-10-57-50.png

    User A.A in group1 could receive this email successfully:
    51532-qa-kyle-10-59-20.png

    Then Admin receive an email which said cannot send emails to Group2:
    51464-qa-kyle-11-01-29.png

    So, if your group configuration are correct, this email will not be accepted by group2. I would suggest you double check about the configuration.


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  2. Alex C 56 Reputation points
    2020-12-29T18:03:34.253+00:00

    I think I'm set up the same way. Interestingly, when Ed sent the message, he did get a bounceback, but still everyone received it. I can't show or test the actual DLs for privacy reasons, but here's the setup. I think it matches your test setup.

    52095-image.png
    52007-image.png
    51978-image.png
    52008-image.png
    52009-image.png