Policy

Use Protected View for attachments received from internal senders

This policy setting allows you to determine if attachments received from senders within your organization open in Protected View. This setting only applies to Outlook accounts setup to use an Exchange server. If you enable this policy setting, attachments received from senders within your organization open in Protected View. If you disable or do not configure this policy setting, attachments received from senders within your organization do not open in Protected View.

Policy
Pack Microsoft Office
Category Microsoft Outlook 2016 / Security
Policy ID 7d65a6cbde76
Internal name L_UseProtectedViewForAttachmentsReceivedFromInternalSenders

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\outlook\security\markinternalasunsafe (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\outlook\security\markinternalasunsafe (disabled) = 0

Policy notes

This policy setting allows you to determine if attachments received from senders within your organization open in Protected View. This setting only applies to Outlook accounts setup to use an Exchange server. If you enable this policy setting, attachments received from senders within your organization open in Protected View. If you disable or do not configure this policy setting, attachments received from senders within your organization do not open in Protected View.

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Allow Active X One Off FormsConfigure Add-In Trust LevelDisable 'Remember password' for Internet e-mail accountsDo not automatically sign repliesPrevent users from customizing attachment security settingsPrompt user to choose security settings if default settings failTurn off contact export