Is sending letters and packages straightforward? What is postal logistics? A complex system of logistics (i. e. “postal logistics”) underlies the dispatch of any letter or package to its recipient. It involves both transport logistics and processing logistics – the handling of letters and packages, which is postal companies’ traditional business. The article addresses and studies two crucial events in the history of Swiss postal logistics: the launch of railway post in 1857 and the introduction of the postal code in 1964, both of which marked profound changes in postal logistics. The changes were far-reaching not only because of their technical and structural impact but also for their implications for postal workers.