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Send a message with that signature using another mailer, then examine the raw MIME content
of that sent message and duplicate the structure of that message using JavaMail.
Possibly the message is being sent as multipart/related with a primary text/html part that references
the image in another part. Search the web for multipart/related examples with JavaMail.
Or just send a regular text/html message that references the image somewhere on the web.
This FAQ entry might help: