Since our tracking is image-based, you will not be able to use Free Email Tracker in plain-text mode. Plain-text mode strips all formatting and images, thus disabling our tracking pixel.
If you would like to switch from plain text to rich text formatting in Gmail, open up a new compose window, click on the down arrow in the Compose toolbar, and uncheck “Plain Text Mode”:
Refresh your Gmail after unchecking “Plain Text Mode”