[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.

[mgarciaisaia]

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.