fml8 selects language of the return mail for command mail and error messages by Accept-Language of the incoming message and other information. See Chapter 33 for more details.
In sending back files or messages, fml8 uses MIME/Multipart. tar.gz and zip formats are not supported..
author's homepage is www.fml.org/home/fukachan/.
Also, visit nuinui's world :) at www.nuinui.net.
For questions about FML, e-mail <fml-bugs@fml.org>.