This information applies to devices with iOS 12, iOS 11, or iOS 10.

It might also notify spam senders that you opened their messages.

you’re able to disable remote images on an iPhone or another iOS equipment through the prefs app.

Mail, Load Remote Images toggle in iOS Settings

On older iOS versions, this setting might be calledMail, Contacts, Calendar.

Scroll down to theMessagessection.

Tap theLoad Remote Imagestoggle switch to move it to the off position and disable it.

Load All Images link in iOS Mail app

If this option is green, then loading remote images is enabled.

Tap it once to disable remote images.

To display images contained only in that email, tapLoad All Images.

This one-time bypass does not re-enable automatic downloads for all emails.