Enforcement Rules of the Government Procurement Act Article 18

Unless otherwise provided for in the Act, a notification provided to a supplier by an entity pursuant to the Act may be in oral, by facsimile transmission, or by other means of electronic data transmission.The oral notification referred to in the preceding paragraph may be recorded if necessary.
中文原文 政府採購法施行細則第18條
機關依本法對廠商所為之通知,除本法另有規定者外,得以口頭、傳真或其他電子資料傳輸方式辦理。
前項口頭通知,必要時得作成紀錄。

English translation for reference only; the Chinese text prevails. Not legal advice.