I dont understand the (Tracking always?) part of the title.
This part of the title was an editorial addition by the submitter. No doubt he his thinking of the use of images in email to signal that the message has been displayed (loading the image sends a request to the server, which can be logged). However, the submitter didn't read the article that he submitted, in which Google explains that they are storing copies of the images on their own servers precisely to disable thes…
Simple: your messages are more safe and secure, your images are checked for known viruses or malware...
Unless I missed something. I read it twice. Can anyone point to text that says otherwise.