Unclaimed mail refers to letters and shipments that, because of wrong addresses, missed deliveries, or abandonment, never reach their intended recipients. These things can be sold through legal channels or put up for auction after accumulating over time. Many people want to know what happens to this kind of letter and whether it is legal to buy. Unusual postal activity and shopping opportunities may occasionally be found by going through unclaimed mail. For bargain hunters and curious readers, learning about unclaimed mail—which includes everything from how it is handled to where to find it—may be interesting and educational.