Embed images in the "Share by email" email

Hi,
When I use the "Share by email" option on the page's menu, with page's content within the email body, and if the xwiki page contains any image, the received html email doesn't show any these images, but instead the space where the image was supposed to be with only the image description.

I've saw the mail's html source code, and the images are direct links to the page's ones, like http://.../xwiki/bin/download/<page name>/<image file>. Directly putting this link on the browser, it opens without problems, regardless if the user is registered or not (my xwiki instance is closed for unregistered users).

I'm using Mozilla Thunderbird and allowing the "load of remote content" for the xwiki sender. I think it's a problem of newer versions too (RC1 and stable).

Could you give a look?