There's another option within the "Email Reconciliation" that you can check. Open the email view and click the trackwheel again to bring up the menu, then select "Options." Select "Email Reconciliation" from there and it will open another screen. On that screen there's a field called "Delete On:" and you can change that to either "Handheld," "Mailbox & Handheld," or "Prompt." If you choose Mailbox & Handheld, it should delete in both places.