what's the attachment filename charset?

[crossany]

I install the 3.1.0 zimbra I sent Mail with attachment used chinese filename
some time hte filename is display good, some time is display eeror code
I know the mail body and subject use utf-8, anbody can tell me what's the attachment filename charset? it's ISO,or ,utf-8.
I see the mail code like this:
filename="个人简历.doc" the attachment chinese filename display it's good and the mail code like this :
filename="»§µµÍйܻú¹¹¼ò½é.doc" the attachment chinese filename display a error code. I want to konw why they are different.
黑体

[KevinH]

Which mail client are you using?

[crossany]

I use firefox 1.5
now I know the attachment filename charset is iso8859-1,
and the mail's context and subject use utf-8
sometime the when I sent a chinese filename attachment wiht a mail the attachment filename charset maybe used the GB2312 after the mail send
I look the the mail in the send box the mail'attachment filename is display error code. I use look the Original mail the filename also display the chinese filename , I look my firefox enconding is GB2312. So I guess the attachment upload used the GB2312 to the zimbra server , and the server consider the filename use iso8859-1 so the filename display the error code.