[oaeuntsh32nts]

Not sure what you mean by, "Apple's mail apps are the ones that load images indiscriminately"? I've been using Apple's Mail.app for years on many different machines with many different accounts from different providers, and I have image loading turned off. I've never seen it load an image when I didn't ask it to. Furthermore, it sounds like Gmail will download all images from a mail and store them on Google's servers, which means they're triggering the tracking from those email providers!

[eli]

Sure, but most people never change any settings. By default it loads all images from all senders