How accurate is email tracking?

To find out if an email has been opened, we load a tiny transparent image and detect when the image has been loaded. As it relies on images, it isn't 100% accurate.
If a recipient's email application has the images turned off, the tracking image won't load, and the email will not be recognized as opened.
In addition there is a short delay between the moment the email is opened and the moment it is visible in the application.

Date created:
01/04/2018 10:34:14
Last updated:
01/04/2018 11:43:05