> And, when Google announced that it would cache email images in their own servers, Google took away the ability for people running newsletter campaigns to detect accurately the open rates of their emails
People already customize email campaigns (inserting customer name in the body, inserting identifying information in the "unsubscribe" link so they can know who wants to unsubscribe, possibly inserting links to per customer offers).
Can't they have the customization code also throw in ?random_number parameters on image URLs to confound caching?
I'm not sure if there is a workaround yet. I was curious about using custom routes randomized this way and intercepting the requested filename. file-<campaign>-<random>.jpg or something. I wonder how mailchimp is doing this now.
People already customize email campaigns (inserting customer name in the body, inserting identifying information in the "unsubscribe" link so they can know who wants to unsubscribe, possibly inserting links to per customer offers).
Can't they have the customization code also throw in ?random_number parameters on image URLs to confound caching?