You might have "Load external resources from trusted senders" turned on in your mail settings. https://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&ans

You might have "Load external resources from trusted senders" turned on in your mail settings. https://mail.google.com/support/bin/answer.py?hl=en&ctx=mail&answer=145919 https://mail.google.com/support/bin/answer.py?hl=en&ctx=...