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Prevent distribution list access in global address list

Peter 100 Reputation points
2023-11-03T07:38:20.8533333+00:00

Hi
A customer which is a school, want's to prevent their students from sending email to distribution list. We tried to allow only teachers to send emails to distribution lists, but what the students now are doing is adding the distribution list in the to field and then expand the distribution list.

The customer uses Exchange Online and the students only use Outlook Web App.

Is there a way to achieve the goal?

Regards
Peter

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Vasil Michev 100.2K Reputation points MVP
    2023-11-03T15:53:54.01+00:00

    Simply hide the DG in question from the GAL? Select it in the EAC > Recipients > Groups > Distribution lists, then under Settings, toggle the Hide this group from the global address list checkbox.

    Or via PowerShell:

    Set-DistributionGroup DG -HiddenFromAddressListsEnabled $true