CMS Made Simple Forums

Hello,

I having problem with the email sendout by the contact form.
current CMS is support with utf-8.. but chinese os/webmail still using big5 to read or send email.
Here is the problem.. the mail send-out is in utf-8 format, but on the reciever can't read the email.
I added the heading:

"Content-Type: text/plain; charset=big5"

but it won't work.
how can I convert to big5 encoding after press submit button? So, reciever can recieved email in big5 format??

Thanks!