To prevent abuse, images in messages are hidden by default. If images in your messages only show empty boxes, be sure to click the "Always display images from..." link at the top of the message.
If the "Always display images from..." link is not available, try the following:
- Log in to your account.
- Click "Settings" in the right corner.
- Scroll to the Browser Connection, under the General tab and check "Don't always use https".
- Click "Save Changes"
- Log out and log back in to your email.