GTrack helps you to track when your emails are opened and when links are clicked.
GTrack also helps you to track how many times your emails were opened, and how many times your links were clicked. This is Gmail tracking at its best. It is free, simple, yet a powerful email-tracker.
When GTrack is used by Quicklution's Mail Merge service you can add the Unsubscribe feature. Try the Mail Merge Google Workspace add-on for free: