How to allow outside senders on a set of Distribution Groups
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Issue: You need to allow mail from outside senders to all or a large set of Distribution Groups using the Exchange Management Shell rather than modifying each group one by one using the GUI Exchange Admin Center or Management Console.
Solution:
Use Management Shell commands to search for any distribution groups or dynamic distribution groups that match a phrase and modify the Outside Senders setting.
Note: you will need to specify your group name you want to search for followed by a "*" Read more [...]