I'd like to encourage you to pay a thorough visit to my three new online exhibitions about World War II and the Holocaust, online at least until the end of this year.
Here are some partial descriptions of some of the postal evidence of the Holocaust that pertain to Lodz. The images that go with these descriptions will be found within each webpage of the exhibition. Just click on the Lodz link that is found within the Tours page of my "Jewish Ghetto" exhibition:
--Judenpost 20-pfennig stamp on an envelope of Rumkowski, the Litzmannstadt ghetto Jewish Elder, canceled March 11, 1944, with the Elder's date stamp, addressed to Nazi administrator Biebow. Being a local stamp, it was valid as postage only inside the ghetto. The address at Baluter Ring was the location of the office where ghetto postal workers exchanged mail with representatives of the German post office.
--An October 18, 1941, envelope from Rumkowski's office to the Association of Jews in Germany, the organization chaired by Rabbi Leo Baeck at Berlin. A May 1, 1941, money order receipt and an October 6, 1942, card acknowledging receipt of money from Prague for a ghetto resident.
--The special cancel on the envelope below reads, "By command of the Führer this city is named Ghetto Litzmannstadt." On a June 30, 1941, postal card from Chmielnik to the Jewish Elders Council of Litzmannstadt, Rose Speiser asked for information about the fate of her daughter, Gana Milter. She had written with this request several times previously, but had received no reply.
--A Łódź ghetto censor passed the January 7, 1941, registered postal card addressed to Epshiki, Russia, was censored by Germany at Berlin, and transited Moscow en route to its destination.
These can all be found within the "Jewish Ghetto" exhibition. Once there, click on the link "Ghetto Entrance" at the bottom of the page and then the Lodz link. One can find links to all three new exhibitions here.