The Prossedi post office was subordinate to the Priverno first class distribution office. In 1871, Prossedi had a population of 1,805.
Prossedi, March 21, 1844, indistinct datestamp (March 23?) addresssed to S. Lorenzo (now known as Amaseno), and rated 1 bajocco due as a letter within the same direzione postale. Pisterzo origin postmark on back, with Piperno transit marking on front.