Policy
Saving messages sent from a shared mailbox to the Sent Items folder
This policy setting controls whether messages sent from a shared mailbox are saved to the Sent Items folder of the shared mailbox. By default, messages sent from a shared mailbox aren't saved to the Sent Items folder of the shared mailbox. If you enable this policy setting, messages sent from a shared mailbox will be saved to the Sent Items folder of the shared mailbox. If you disable or don’t configure this policy setting, messages sent from a shared mailbox won’t be saved to the Sent Items folder of the shared mailbox.
56b4f9b4e72d L_DelegateSentItemsStyle Registry
Copy registry mappings
HKCU\software\policies\microsoft\office\16.0\outlook\preferences\delegatesentitemsstyle (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\outlook\preferences\delegatesentitemsstyle (disabled) = 0Policy notes
This policy setting controls whether messages sent from a shared mailbox are saved to the Sent Items folder of the shared mailbox. By default, messages sent from a shared mailbox aren't saved to the Sent Items folder of the shared mailbox. If you enable this policy setting, messages sent from a shared mailbox will be saved to the Sent Items folder of the shared mailbox. If you disable or don’t configure this policy setting, messages sent from a shared mailbox won’t be saved to the Sent Items folder of the shared mailbox.