The Priority shipping label has a place for a eturn address and I had always been putting my return address label on the shipping label until a couple of years ago. I mailed a package to PA and it went to a small post office which scanned the shipping label but picked up the zip code on my return address so it was sent back to Nashville. Upon arriving in Nashville, where they had more modern scanning machines, the label was scanned corectly and immediately sent back to PA, which promptly sent it back to Nashville. This went on for ten days before it finally arrived at its destination. Needless to say the daylily was yellowed and dried out. The problem was finally explained to me by a local post master who did some digging into the problem. Since that time, I NEVER put my return address on the Priority shipping label.
