They changed about two years ago to run all images sent to a gmail address through their servers (and presumably store them). It specifically didn&#x27;t effect marketing though. I was working in email marketing at the time and there was some temporary gnashing of teeth but this was not much more than a blip.<p><a href="https:&#x2F;&#x2F;blog.filippo.io&#x2F;how-the-new-gmail-image-proxy-works-and-what-this-means-for-you&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blog.filippo.io&#x2F;how-the-new-gmail-image-proxy-works-...</a>