If you have lots of shared mailboxes in your Microsoft 365 tenant, you may not want these to be visible in your Global Address List (GAL).

This could be the case if you use the Office 365 Shared Mailbox feature as an archive for users/employees who have departed.

To stop the address showing in the Global Address List, follow the steps below:

1. Load the admin portal: https://admin.microsoft.com/

2. Select Teams & Groups > Shared Mailboxes

3. Select the shared mailbox you’d like to hide from the GAL

4. Click Edit under Show in global address list

5. Untick the option to Show in my organization’s global address list

6. Click the Save button

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