Administrative Procedure Act Article 83
Where the party or his agent has appointed a person to accept service for him and a notice thereof has been given to the administrative authority, service shall be executed on the person so appointed.In the case of an application filed with the administrative authority by post, the administrative authority may order that the party appoint within a specified time limit a person to accept service for him if he maintains no domicile or residence, or business office or business establishment, at the place where the application was posted.If the party fails to appoint a person to accept service within the time limit specified under the preceding paragraph and notify the administrative authority accordingly, the administrative authority may note down on the document for service the domicile or residence, or the place of business office or business establishment, of the party or his agent, and deliver the same to a post office to be sent by a registered mail. The service shall be deemed to have been duly effected at the time when the document is so delivered to the post office.
中文原文 行政程序法第83條
當事人或代理人經指定送達代收人，向行政機關陳明者，應向該代收人為送達。
郵寄方式向行政機關提出者，以交郵地無住居所、事務所及營業所者，行政機關得命其於一定期間內，指定送達代收人。
如不於前項期間指定送達代收人並陳明者，行政機關得將應送達之文書，註明該當事人或代理人之住居所、事務所或營業所，交付郵政機關掛號發送，並以交付文書時，視為送達時。
郵寄方式向行政機關提出者，以交郵地無住居所、事務所及營業所者，行政機關得命其於一定期間內，指定送達代收人。
如不於前項期間指定送達代收人並陳明者，行政機關得將應送達之文書，註明該當事人或代理人之住居所、事務所或營業所，交付郵政機關掛號發送，並以交付文書時，視為送達時。