You may want to restrict the delete items from most users and just assign one or two users to be able to delete. You can use the retention time from the server to be able to undelete items after they have been deleted.
Another option would be to open the email you'd like to send to the secondary Deleted Items folder, click the "Move to Folder" icon and choose the correct Deleted Items folder from the list. There will most likely be two visible, so make sure you choose the correct one. This works for me, although if I try it without opening the email first, it goes to my local Deleted Items.
— Geoff F.
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