According to the letter of the Ministry of Education on January 16, 2017, Taiwan Education(4) No. 1060006297:
Subject : In order to prevent the leakage of official information, all colleagues should use the email allocated by the unit to send and receive official information, and must not use non-official mailboxes for official mail delivery. Please check and transfer the units and schools under the jurisdiction to cooperate.
Description : According to the letter from the Secretary General of the Executive Yuan, Taiwan Protection No. 1050190287 ( as attachment ).
It is recommended that faculty and staff use the official mail system ( e.g. z+StaffID@email.ncku.edu.tw ) or the information infrastructure services provided by Computer & Network Center ( e.g. MyBox ... ) to exchange the official information of the school.