law: Indian Post Office Act, 1898 
  31. Power to require insurance of postal articles 
  The Central Government
  
  may, by notification in the Official Gazette, declare in what cases insurance
  
  shall be required, and direct that any postal article containing anything
  
  required to be insured, which has been posted without being insured, shall be
  
  returned to the sender or shall be delivered to the addressee, subject to the
  
  payment of such special fee as may be fixed by the notification:
  Provided that the levy
  
  of such special fee as aforesaid shall not impose any liability upon 32[the
  
  Central Government 33[***]] in respect of the postal article.