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I tried using the browser extension "Mailtrack" for Gmail · Inbox which shows at a glance whether send mail has been opened to the other party - GIGAZINE
![Mailtrack.io on Twitter: "@natecorbitt If that doesn´t work, however, then go to your Gmail settings, click on the add-ons tab then manage and click the 3 vertical dots for Mailtrack to have Mailtrack.io on Twitter: "@natecorbitt If that doesn´t work, however, then go to your Gmail settings, click on the add-ons tab then manage and click the 3 vertical dots for Mailtrack to have](https://pbs.twimg.com/media/DfjbqgjW0AEshiA.jpg)
Mailtrack.io on Twitter: "@natecorbitt If that doesn´t work, however, then go to your Gmail settings, click on the add-ons tab then manage and click the 3 vertical dots for Mailtrack to have
![How to Remove Mailtrack from gmail - Mailtrack is the addon for Free email tracking in gmail - (AK) - YouTube How to Remove Mailtrack from gmail - Mailtrack is the addon for Free email tracking in gmail - (AK) - YouTube](https://i.ytimg.com/vi/0vGkv19T_jA/maxresdefault.jpg)