4 ms·Google's service delays downloading the image until the moment it is requested by the client.by forgotmypw3 7y agoGoogle's service delays downloading the image until the moment it is requested by the client.ehsankia 7y agoBut is that when they "open" the email, or simply them opening Gmail?Andrex 7y agoMailchimp analytics would outright not work if it was the latter, so it's probably the former.zimmund 7y agoCorrect. This is how Mailchimp and other similar services can tell if you opened an email.