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How to prevent AD Synced Distribution Group from receiving external email?

Hi,

Since we are not able to configure this setting on Exchange online as the group is managed in the local AD, how can we prevent a local AD Synced Distribution Group from receiving email from external domains?
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suriyaehnop
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Have you check the "require authentication" in distribution group? By default shall set to true, meaning only internal user can send the email to distribution, external user will be rejected
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Vasil Michev (MVP)
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Vasil, I suspected as much, but since there is an onsite server running exchange for a different domain I was hoping there would be another option in order to avoid nasty surprises. At this moment I unchecked syncing any Exchange Attributes in order to avoid any nasty surprises.