Darlene Yazzie tends to her livestock outside her home near Dennehotso, Arizona, on Sept.18, 2020. There are no mailboxes or mail carriers in Dennehotso or any of the other Navajo communities that dot the mesas and scrublands of northeastern Arizona, and an envelope sent from here to anywhere else in the state travels hundreds of miles through Albuquerque and Phoenix first. (Sharon Chischilly/The New York Times)