Service of orders: multiple modes including direct delivery, post, email, common portal, publication or affixture; deemed served. Section 153 authorises multiple modes for serving orders, notices and communications under the Customs Act: direct tender to the addressee or authorised representative, registered/speed post or courier with acknowledgement to the last known business or residence, e-mail, availability on a common portal, publication in a local newspaper, or affixture at the last known business or residence (or office notice board/official website if impracticable). Such communications are deemed served when tendered, published or affixed/uploaded; registered post is deemed received after normal transit unless disproved.