Need help in sending mail using UTF-8

Hi,

I m trying to send a mail with chinese characters using Apache Mailer. 
So, I need to set the charset as UTF-8.

In my JSP, I m setting the header as <MailTagLib:header 
name="content-type" value="text/html;charset=UTF-8" />. This is inside 
<mail> tag and before <send> tag. But when the mail is sent, I dont see 
the mail with Chinese characters. Instead, I see "???". When I see the 
source code for the email, I see that information

MIME-version: 1.0
Content-type: text/plain
Content-transfer-encoding: 7BIT

Is there anything wrong I m doing. Can you please help me solve this issue.

Thanks
Ram