Administrative Procedure Act Article 68

Service may be executed either by the administrative authority itself or through the post office.A document of an administrative authority duly sent by exchange of telegraphs, telex, facsimile or other electronic means shall be deemed to have been served by the administrative authority itself. Service to be executed through the post office shall be sent by regular mail services; provided that documents with material impact on the right or obligation of the person upon whom service is made shall be posted by registered mail. In the case of service of a document executed by the administrative authority itself, the officer in charge of the business or the officer responsible for service of process shall be the process server; and in the case of service executed through the post office, the postman shall be regarded as the process server. The Enforcement Rules Governing Service of Process by Post Office established under Article 3 of the Enforcement Law of the Code of Civil Procedure shall apply mutatis mutandis to service executed through the post office in pursuance of the preceding paragraph.