使用emailjs发邮件，附件名称中文乱码

我使用https://github.com/eleith/emailjs来做node邮件发送的功能。遇到了中文附件名称乱码的问题。邮件发送部分代码:

server.send({
    text: "i hope this works",
    from: "sxyx2008[@163](/user/163).com",
    to: "sxyx2008[@163](/user/163).com,sxyx2008[@gmail](/user/gmail).com",
    cc: "sxyx2008[@gmail](/user/gmail).com",
    subject: "testing emailjs",
    attachment: [{
        data: "<html>i <i>hope</i> this works!<br/>Go语言编程.pdf</html>",
        alternative: true
    }, {
        path: "E:/学习资料/Go语言编程.pdf",
        type: "application/pdf",
        name: new Buffer("Go语言编程.pdf").toString("utf-8")
    }]
}, function(err, message) {
    console.log(err || message);
});

控制台log输出:

{ attachments:
   [ { path: 'E:/学习资料/Go语言编程.pdf',
       type: 'application/pdf',
       name: 'Go语言编程.pdf' } ],
  alternative:
   { data: '<html>i <i>hope</i> this works!<br/>Go语言编程.pdf</html>',
     alternative: true,
     charset: 'utf-8',
     type: 'text/html',
     inline: true },
  header:
   { 'message-id': '<1399952046387.0.4252[@acer](/user/acer)>',
     date: 'Tue, 13 May 2014 11:34:06 +0800',
     from: 'sxyx2008[@163](/user/163).com',
     to: 'sxyx2008[@163](/user/163).com,sxyx2008[@gmail](/user/gmail).com',
     cc: 'sxyx2008[@gmail](/user/gmail).com',
     subject: '=?UTF-8?Q?testing_emailjs?=' },
  content: 'text/plain; charset=utf-8',
  text: 'i hope this works' }

邮箱中附件显示乱码如下: