Why must I provide With This Favor with a physical address for my shipment to arrive?

With This Favor's shipping carriers mandate that a physical address be provided at time of "checkout." It is the customer's responsibility to provide the correct physical address for shipping. In the event our shipping carriers are unable to deliver your shipment due to incorrect address, your order will be returned to With This Favor. The customer must then provide us the correct shipping address and will be responsible for all reshipping fees associated with re-delivery. Please make sure to double-check your order.