User Configuration > Administrative Templates > Microsoft Outlook 2016 > Account Settings > RSS Feeds
User
HKCU\software\policies\microsoft\office\16.0\outlook\options\rss
This policy setting allows you to control whether Outlook automatically downloads enclosures on RSS items. If you enable this policy setting, Outlook will automatically download enclosures on RSS items. If you disable or do not configure this policy setting, enclosures on RSS items are not downloaded by default.