One mailbox with multiple additional mailboxes. When sending AS the other mailboxes sent mail should come in those mailboxes sent items. Same for Deleting Items
Use Cache mode otherwise mails will stay in your Outbox.
Method 1: Set the DelegateSentItemsStyle registry value on the Outlook client Note Outlook must be configured to run in cached mode for this option to work correctly. For more information, see the following Microsoft Knowledge Base article:
2703723 (https://support.microsoft.com/en-us/kb/2703723) Email remains in the Outbox when you use the DelegateSentItemsStyle registry value
If you're running Outlook 2010, install the Outlook 2010 ho...