This is fully official: https://github.com/blog/1214-notification-email-improvements https://github.com/blog/1214-notification-email-improvements > Notificatio

This is fully official: https://github.com/blog/1214-notification-email-improvements https://github.com/blog/1214-notification-email-improvements > Notifications that are read as HTML email are automatically marked as read in the github.com notifications interface. An invisible image is embedded in each mail message to enable this. If your client displays email in HTML (GitHub also sends the text version) and does not intercept images, then your client is leaking, and you should be concerned for your privacy every time you open a email. I suggest to give a spin to this checker: https://emailprivacytester.com/ https://emailprivacytester.com/