You'd think that wouldn't you. I found ways to track this stuff even when remote images are disabled in Thunderbird, Apple Mail, Android Mail, Mail on iOS, Outl

You'd think that wouldn't you. I found ways to track this stuff even when remote images are disabled in Thunderbird, Apple Mail, Android Mail, Mail on iOS, Outlook, tonnes of webmail apps: https://secure.grepular.com/Apple_Mail_Privacy_Hole https://secure.grepular.com/Apple_Mail_Privacy_Hole https://secure.grepular.com/iOS4_iPhone_Email_Privacy_Leak https://secure.grepular.com/iOS4_iPhone_Email_Privacy_Leak https://secure.grepular.com/DNS_Prefetch_Exposure_on_Thunderbird_and_Webmail https://secure.grepular.com/DNS_Prefetch_Exposure_on_Thunder... I created a web application which crafts an email with lots of tests and sends it your address. When you open it, it tries to "call back" to my server and the web page shows you the results. If you see anything on there before hitting "Load Images" your client has a problem. You can access the app here: https://secure.grepular.com/email_privacy_tester/ https://secure.grepular.com/email_privacy_tester/