I haven't tested it yet, but it seems you can setup your tracking image to return a "Cache-Control: no-cache, max-age=0" header and it will always be reloaded w

I haven't tested it yet, but it seems you can setup your tracking image to return a "Cache-Control: no-cache, max-age=0" header and it will always be reloaded when the email is opened. http://blog.movableink.com/real-time-content-and-re-open-tracking-return-to-gmail/ http://blog.movableink.com/real-time-content-and-re-open-tra...