(1) A notice required by or under this Act to be served to a petitioner, an opposite party or any other person may be served on the petitioner, opposite party or other person, as the case may be, by sending the same at the address of the petitioner, opposite party or other person, as the case may be, by registered post, acknowledgement due.
(2) When an acknowledgement purporting to be signed by the addressee or his agent is received by the Commission or an article containing the notice is received back by the Commission with an endorsement purporting to have been made by a postal employee to the effect that the addressee or his agent had refused to take delivery of the article or had avoided by any means to take delivery of the article, the Commission shall declare that the notice had been duly served on the addressee:
Provided that where the notice was properly addressed and duly pre-paid and sent by registered post, acknowledgement due, a declaration referr‘,.(1 to in this sub-section shall be made notwithstanding the fact that the acknowledgement has not, for being lost or mislaid or any other reason, been received by the Commission within thirty days from the date the notice was so sent.
(3) The notice referred to in sub-section (1) may alternatively or additionally be sent through such courier company or by such other means, and, in that case, the declaration referred to in sub-section (2) shall be subject to such conditions, as the Chairperson may specify.
Explanation.—For the purposes of this sub-section, "courier company" means—
(a) a concern,
(b) a firm or any other association or body of individuals, or
(c) a body corporate or authority, rendering the service of a courier.
(4) A notice required by or under this Act to be served to a petitioner, an opposite party or any other person shall be addressed to the place where the petitioner, opposite party or other person, as the case may be, actually and voluntarily resides, or personally works for gain, or carries on business.
Explanation.—For the purposes of this sub-section, an association or a body of individuals, a body corporate or an authority shall be deemed to carry on business at its sole or principal office.