The Customs 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.