law: Indian Post Office Act, 1898 
  14. Post office marks Prima facie evidence of certain
  
  facts denoted
  In every proceeding
  
  for the recovery of any postage or other sum alleged to be due under this Act
  
  in respect of a postal article,-
  (a) the production of
  
  the postal article, having thereon the official mark of the Post Office
  
  denoting that the article has been refused, or that the addressee is dead or
  
  cannot be found, shall be prima facie evidence of the facts so denoted, and
  (b) the person from
  
  whom the postal article purports to have come, shall, until the contrary is
  
  proved, be deemed to be the sender thereof.