getting residence proof document from indian post offices?

I have heard Indian Post offices started giving residence proof document for a fee of 250rs. Can anyone suggest if it is correct or not? I live in Mumbai and would like to get one? What documents are required by the post office to issue someone that document?
I found identification cards at the
but not anything about residence proof document
prad, thanks for the reply. But, when i called a few post offices in Mumbai and Navi Mumbai they were clueless about it. Can u offer some more suggestions of getting a residence proof which will be accepted by government? Can getting a LIC policy work? If so, how do I get that for minimum amount just for the sake of address proof? Can you please clarify? Thanks