On July 13, 1940, the conditions of postal communication between the ghetto and the outside world were established. The ghetto residents were only allowed to use postcards, written only in German. Later, however, the post was withheld. Officials seized packages sent to the inhabitants of the ghetto. All residents also had to give away their telephones. In March 1940, in the buildings at Kościelny Square 4/6, a post office opened, which, despite censorship, allowed the inhabitants of the ghetto to maintain contact with the outside world for as long as it was possible. The exchange of post took place in a building specially constructed for this purpose, located at Bałucki Market. It was there that correspondence and parcels arrived (and were often requisitioned), as well as money sent from the occupied Polish lands and abroad. The post office administered delivery of private and official correspondence in the ghetto. The office also issued its own stamps for the internal circulation within the ghetto.
