Sent items from shared mailbox via Acrobat Reader

Hi,

we all know the registry key DelegateSentItemsStyle to get Outlook to save sent items to shared mailbox but:

this doesn't work if you open a pdf file, and select to send it as attachment in a new email. It will open a New Outlook message, you can still select the From address to be the shared mailbox but the actual sent email is saved in your default mailbox. Is there any solution to fix this?