Show embedded picture using node (nodemailer)

I use nodemailer to send mail with a embedded picture,

var mailOption = {
    html: 'Embedded image: <img src="cid:unique@kreata.ee"/>',
    attachments: [{
        filename: 'image.jpg',
        content: '/9j/4AA ... Q==',
        encoding: 'base64',
        cid: 'unique@kreata.ee'
    }]
    from: '...',
    to: '...',
    subject: '...'
}
var nodemailer = require('nodemailer');
var transporter = nodemailer.createTransport();
transporter.sendMail(mail, function(error, info) {
    ...
});

I can recieved the mail from Outlook, However the picture cannot show in Outlook. I have 2 question,

1. How to show picture in Outlook using nodemailer module (or others)
2. How can I print the entire mail include header and body in above code.