we don't make too much of a distinction in Germany or Austria in general usage of the word - while what you point out is technically correct, pretty much everyb

we don't make too much of a distinction in Germany or Austria in general usage of the word - while what you point out is technically correct, pretty much everybody here will understand "KZ" as "the whole of the nazi death machinery" and will definitely want to avoid to append it to their mail address in such a prominent way