Service of notice: prescribed modes establish effective delivery and deeming rules for GST communications. Service of notice under the Rajasthan GST Act may be effected by personal delivery (including to authorised representatives or family/employees), registered or speed post with acknowledgement, e mail provided at registration, availability on the common portal, publication in a local newspaper, or-if none practicable-affixure at the last known business/residence or on the issuing office's notice board. Service is deemed to occur on the date it is tendered, published or affixed; communications by registered or speed post are deemed received after normal transit unless proved otherwise.