law: Indian Post Office Act, 1898 
  56. Penalty for fraudulently sending unpaid postal
  
  articles
  Whoever, being an
  
  officer of the Post Office, sends by post, or puts into any mail bag, any
  
  postal article upon which postage has not been paid or charged in the manner
  
  prescribed by this Act, intending thereby to defraud the Government of the
  
  postage on such postal article, shall be punishable with imprisonment for a
  
  term which may extend to two years, and shall also be punishable with fine.