Policy

Prevent users from customizing attachment security settings

This policy setting prevents users from overriding the set of attachments blocked by Outlook. If you enable this policy setting users will be prevented from overriding the set of attachments blocked by Outlook. Outlook also checks the "Level1Remove" registry key when this setting is specified. If you disable or do not configure this policy setting, users will be allowed to override the set of attachments blocked by Outlook.

Policy
PackMicrosoft Office
CategoryMicrosoft Outlook 2016 / Security
Policy ID1b1f37ff4d34
Internal nameL_Preventusersfromcustomizingattachmentsecuritysettings

Registry

Copy registry mappings

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

Policy notes

This policy setting prevents users from overriding the set of attachments blocked by Outlook. If you enable this policy setting users will be prevented from overriding the set of attachments blocked by Outlook. Outlook also checks the "Level1Remove" registry key when this setting is specified. If you disable or do not configure this policy setting, users will be allowed to override the set of attachments blocked by Outlook.

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Allow Active X One Off FormsConfigure Add-In Trust LevelDisable 'Remember password' for Internet e-mail accountsDo not automatically sign repliesPrompt user to choose security settings if default settings failTurn off contact exportUse Protected View for attachments received from internal senders