Policy

Do not expand Contact Groups

This policy setting controls whether Outlook users can expand Contact Groups when addressing e-mail messages. If you enable this policy setting, Outlook users cannot expand Contact Groups. If you disable or do not configure this policy setting, when Outlook users add a Contact Group to the To, CC, or BCC fields of an e-mail message or other item, they can expand the Contact Group to see the e-mail addresses of everyone in the group.

Policy
Pack Microsoft Office
Category Microsoft Outlook 2016 / Miscellaneous
Policy ID 6370386a4720
Internal name L_Disabledistributionlistexpansion

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\outlook\options\mail\disabledlexpansion (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\outlook\options\mail\disabledlexpansion (disabled) = 0

Policy notes

This policy setting controls whether Outlook users can expand Contact Groups when addressing e-mail messages. If you enable this policy setting, Outlook users cannot expand Contact Groups. If you disable or do not configure this policy setting, when Outlook users add a Contact Group to the To, CC, or BCC fields of an e-mail message or other item, they can expand the Contact Group to see the e-mail addresses of everyone in the group.

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