Administrative Procedure Act Article 77
Where service of process is executed by an administrative authority upon a third party out of an application made by the party, the administrative authority shall notify the party of the successful execution of the service or the reason for non-execution thereof.
中文原文 行政程序法第77條
送達係由當事人向行政機關申請對第三人為之者，行政機關應將已為送達或不能送達之事由，通知當事人。