Send email with attachment MIME

When sending the email out with an image, I am not able to see the image in my gmail/outlook, the image would disappear. When clicked on show original message, I am able to see the image in html text eg, "data:image/png;base64,xxxxxx"

Am I lacking of some code?

        MimeMessage msg = new MimeMessage(mail_session);

        //Set Recipients
        msg.setRecipients(Message.RecipientType.TO, email_to);

        msg.setFrom(new InteetAddress(email_from));

        //Set Subject
        msg.setSubject(email_subject);

        //Set Content
        String msg_text = email_contents;

        //msg.setText(msg_text);
        Multipart multipart = new MimeMultipart();
        BodyPart textPart  = new MimeBodyPart();
        textPart.setDisposition(BodyPart.INLINE);                   
        textPart.setContent(email_contents, "text/html");   
        multipart.addBodyPart(textPart);
        msg.setContent(multipart);
        Transport.send(msg);


    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }