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Re:GMail will now always show images by default by free652 on Thursday December 12, 2013 @12:07PM (#6895533)
Looks like gmail proxies the images via https://ci5.googleusercontent.com/proxy/. I don't see an issue, gmail is already tracking me, but the sender can't track me.
Re:GMail will now always show images by default by blazingice on Thursday December 12, 2013 @12:16PM (#6895586)
Does the fetch happen immediately when Google receives the email? Or does it occur the first time the user opens the email?

If the latter, sender image tracking will be alive and well.

Re:GMail will now always show images by default by untog on Thursday December 12, 2013 @12:49PM (#6895819)
Yes they can. All I need to do is

    <img src="image.jpg?userid=123456"/>
and I can tell whether you opened it or not. Google could strip out query strings in their proxy, but I'm not sure that's a good idea.
Re:GMail will now always show images by default by palebluedot on Thursday December 12, 2013 @12:54PM (#6895860)
Presumably Google would cache the image on receipt, not on open. If that is the case, then the sender has no way of knowing if you actually opened the email (unless you do so from a desktop IMAP/POP client).