law: Custom Act, 1962 
  153.
  
  Service of Order, Decision, Etc. – 
  Any
  
  order or decision passed or any summons or notice issued under this Act, shall
  
  be served –
  (a)
  
  by tendering the order, decision, summons or notice or sending it by registered
  
  post to the person for whom it is intended or to his agent; or
  (b)
  
  if the order, decision, summons or notice cannot be served in the manner
  
  provided in clause (a), by affixing it on the notice board of the customs
  
  house.