law: Indian Post Office Act, 1898 
  36. Power to give effect to
  
  arrangements with other countries 
  (1) Where arrangements
  
  37[made] with the United Kingdom , or with any British
  
  possession, 38[39[***] or foreign country are in force],
  
  for the transmission by post of registered, insured or value-payable postal
  
  articles between 5[ India ] and the United Kingdom or such possession 40[41[***]
  
  or country], the Central Government may make rules to give effect to such
  
  arrangements.
  (2) In particular and
  
  without prejudice to the generality of the foregoing power, such rules may
  
  prescribe-
  (a) the form of declaration to be made by the
  
  senders of such postal articles as aforesaid; and
  (b) the fees to be
  
  charged in respect thereof