Dead letter mail or undeliverable mail is mail that cannot be delivered to the addressee or returned to the sender.ith increased collection and study of the postal markings originating from such offices, the body of literature on this obscure topic may grow. Many countries, including Canada and the United States, have issued special labels for envelopes that have travelled through the dead letter office.
For other uses, see Memphis (disambiguation). Memphis is a city in the southwestern corner of the U.S. state of Tennessee and the county seat of Shelby County. The city is located on the fourth Chickasaw Bluff, south of the confluence of the Wolf and Mississippi rivers. Memphis had a population of 653,450 in 2013, making it the largest city in the state of Tennessee.
Shelby County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 927,644. It is the state's largest county both in terms of population and geographic area. Its county seat is Memphis, the most populous city in Tennessee. The county was named for Governor Isaac Shelby (1750â1826) of Kentucky. Shelby County is part of the Memphis, TN-MS-AR Metropolitan Statistical Area. It is bordered on the west by the Mississippi River. Within the Mississippi Delta, the county developed as a center of cotton plantations in the antebellum era, and cotton continued as an important commodity crop well into the 20th century.