✔ 最佳答案
The question is one of security. If a Letter Carrier can leave a parcel at a relatively secure location, or if the sender has opted to use the "Carrier leave if no response" label then the item can be left. You can also make prior arrangements by talking to your Letter Carrier or calling the PO. If delivery is not possible you will receive a peach colored form 3849 in your mailbox. On the back of the form you can indicate delivery requests. You can even request that items be left with neighbors, relatives or they can even be forwarded to your place of business. BTW the sticky labels are used by the other guys, not the Postal Service.