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javamail mail image located on remote machine
BodyPart imagen = new MimeBodyPart();

DataSource ds=new FileDataSource("c:/image.gif");
image.setDataHandler(new DataHandler(ds));

image.setHeader("Content-ID","img");

BodyPart imagen = new MimeBodyPart();

URL url = new URL("http://server.com/mybestpicture.jpg");
URLDataSource ds = new URLDataSource(url);
image.setDataHandler(new DataHandler(ds));

image.setHeader("Content-ID", "img");