Over the last three days, I have done some reading on postal banking. I have a few copies here of the FTQ brief, which is probably the best example. I think it refers to that.
Canada Post has also prepared a document, but I do not have a lot of experience, I could not tell you what happened in Japan.
If I understood correctly, some countries have found that one solution is that profits from postal banking make it possible to retain a high-quality postal system.