How to prevent open tracking in Gmail app on iOS Google's documentation says:


  Images will always appear in the Gmail app on your iPhone or iPad.


(This is different from opening Gmail in a browser on a computer, where I see settings that provide a choice: either "Always show images" or "Ask before showing images".)

How can I read Gmail messages on my iOS devices if I want to ensure that my opens can't be tracked?

P.S. The page linked above interestingly does not say:


  "Sometimes, senders may know whether you've opened an email that has an image." 


even though the "Computer" tab on that page does. I can't tell whether this implies that Gmail opens are NOT trackable in iOS.
As of Sep 3, 2019, version: 6.0.190811, you can Choose to be asked before external images are displayed automatically.


  To enable this for new incoming messages, go to Settings > specific account > Images and select Ask before displaying external images.
  
  


Gmail App - Account Settings - General