Comment by davchana
Long time ago somebody told that gmail pre fetches all images, so tracker pixels report exactly one open occurrence for images in gmail email.
Long time ago somebody told that gmail pre fetches all images, so tracker pixels report exactly one open occurrence for images in gmail email.
Disabling external images was the default until they started proxying+caching the images themselves. So now _by default_ clients get to see the images without sending tracking data to the senders - Google doesn't like competition.
I still keep the images disabled, though. In most cases, you don't care about what's there in the images anyway.