law: Indian Post Office Act, 1898 
  11. Liability for payment of postage 
  (1) The addressee of a
  
  postal article on which postage or any other sum chargeable under this Act is
  
  due, shall be bound to pay the postage or sum so chargeable on his accepting delivery
  
  of the postal article, unless he forthwith returns it unopened:
  Provided that, if any such
  
  postal article appears to the satisfaction of the Post Master General to have
  
  been maliciously sent for the purpose of annoying the addressee, he may remit the
  
  postage.
  (2) If any postal
  
  article on which postage or any other sum chargeable under this Act is due, is
  
  refused or returned as aforesaid, or if the addressee is dead or cannot be
  
  found, then the sender shall be bound to pay the postage or sum due thereon
  
  under this Act.