In May 1940, an agreement was concluded between Rumkowski and the Reich Post Office on the exchange of mail, while in June 1940, rules were established for sending correspondence. They were communicated to ghetto residents in Announcement No. 63.
In Proclamation No. 121, which was published on September 16, 1940, further rules for the use of mail were detailed:
The obligation to write in German caused difficulties for some ghetto residents. To solve this problem, application writing offices were established at both postal branches in February 1941. A notice informing about the offices also contained detailed correspondence rules for those writing cards or letters on their own.
Double postal fees were imposed on ghetto residents, in addition to higher than the German tariff. Both mail sent from the ghetto and mail delivered were charged. Ghetto letter carriers charged 10 fenigs (in ghetto currency) for a post card, 20 fenigs for a domestic letter and 20 fenigs for a foreign delivery.
A shortage of petty cash led the Postal Department to obtain permission in May 1942 to print vouchers with a denomination of 10 fenigs.
The prevailing poverty in the ghetto meant that many people were exempted from paying fees. Postal cards addressed to the Superior Jewish Elders and certain offices, most notably the Labor Office, were also delivered without fees. There were times when Rumkowski allowed letters with official letters to be dropped into mailboxes without additional fees.
The stamp Frei von Zuschlaggebühr (free of additional charge) was put on parcels exempt from fees.