Regulation on the Electronic Exchange Operations of Official Documents of Government Agencies Article 6

The government agencies' document handling unit shall be responsible for handling electronic official documents exchange operations; however, it is possible that this requirement shall not apply to the specific official documents depending on the nature of the documents , the recipients, and the time sensitivity of the exchange, so long as there are appropriate control procedures in place.
中文原文 機關公文電子交換作業辦法第6條
各機關應由文書單位負責辦理機關公文電子交換作業。
但依公文性質、行文對象及時效,有適當控管程序者,不在此限。

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