Should the outbound delivery be unsuccessful for whatever reason, all carriers charge for a ‘return to sender / consignor’ and is often, more expensive than the outbound shipping.

Why? Because the cost of a return (reverse logistics), is significantly greater than that of the outbound delivery, as 1. the item travels on its own without the consolidation of the outbound parcels and 2. every return is unique, as in the networks are not set up specifically to deliver each return.