Always obtain tracking information when shipping physical goods.
Require that the shipment is signed for at the time of delivery. This is especially important for high value items.
Confirm that the shipping address is a valid address (not a PO Box or a freight forwarding company, which may have the word “shipping” in it).
Keep the customer updated on any delays and inform them of the expected delivery date if an issue arises.
Offer to provide a refund if you cannot ship the merchandise in the timeframe provided to the customer.