I no longer have that problem but let me give an example. Person lives in a small condo complex that does not provide a cluster box (CBU) for mail delivery by

I no longer have that problem but let me give an example. Person lives in a small condo complex that does not provide a cluster box (CBU) for mail delivery by USPS. Residents then must get a PO Box for delivery or, if they are short term seasonal in a rural area, they may be able to get the post office to hold mail at the counter for them to pick up periodically (they aren't thrilled to do this either).