Every now and then I return-to-sender something that looks important to my address's previous resident and sharpie out the barcode along the bottom. If you don'

Every now and then I return-to-sender something that looks important to my address's previous resident and sharpie out the barcode along the bottom. If you don't do this your RTS items will come back to you regardless of what you stamp it with. Even still I receive an informed delivery photo of it. My belief is that the informed delivery system is using optical recognition while the sorters are using the barcodes.