4 ms·
I thought that this trick was as old as html email, and that (at least) gmail was actually caching images on their side to prevent tracking?
by Udik 7y ago
I thought that this trick was as old as html email, and that (at least) gmail was actually caching images on their side to prevent tracking?
- Mathnerd314 7y agoThey're proxied but follow the caching rules sent by the server, so for tracking purposes they're not cached. You get entries with proper date/time, proper tracking ID, but anonymous Google IP / user agent. Posts I found that seem readable: https://movableink.com/blog/gmails-recent-image-handling-changes-the-impact-and-resolution/ https://movableink.com/blog/gmails-recent-image-handling-cha... https://movableink.com/blog/real-time-content-and-re-open-tracking-return-to-gmail/ https://movableink.com/blog/real-time-content-and-re-open-tr...
- chipperyman573 7y agoI may be wrong but I believe google cached it after you open the email first. So your IP is hidden and you can't tell how many times someone has opened an email, but you know the timestamp of the first time they do.
- jalk 7y agoThe Gmail image-proxy honors the regular http cache headers, so marketing mails get their open rates ‘correct’ but cannot see cookies/ip addresse