User Configuration > Administrative Templates > Microsoft Outlook 2016 > Security > Trust Center
User
HKCU\software\policies\microsoft\office\16.0\outlook\options\mail
This policy controls whether Outlook displays Loop components that are supported by installed apps without requiring users to explicitly choose to load them. If you enable this policy setting, Outlook will automatically display Loop components in emails. This applies to all messages or specifically to messages that originate within the recipient's local tenant or organization. This might involve contacting servers used by the installed apps to retrieve Loop components. If you disable this policy setting, Outlook will not load content from external servers automatically, unless the sender is included in the Safe Senders list. Recipients will have the option to manually load Loop components from untrusted senders on a message-by-message basis. If you do not set this policy setting, Outlook will default to the “enabled" setting. Note: Loop components included in messages located in the Junk Mail folder will not load automatically, regardless of the policy setting specified. Loop components will only be shown for apps that are installed, ensuring security and a tailored experience in Outlook.