It’s called Mailtrack.
Mailtrack is a free Google Chrome extension that brings the delivery marks you usually get on instant messaging applications, to email accounts (it supports only Gmail for now). The tool is fairly straightforward, a single tick next to your email dictates that it has been delivered to the end server and a double green check suggests that it has been read by the recipient. You can even hover over the mark and see the receiver’s computing platform, how many times it was opened, and the time of course. That’s basically, what Mailtrack does. For setting it up, head over to the Chrome web store and download the extension. You will then need to provide access to the email account, and that’s about it. Once successfully plugged in, you’ll see a little Mailtrack icon on top of your Gmail’s landing page, and a set of marks next to the “sent mail” folder. Whenever you’ll compose a new message, there will be a Mailtrack signature on the bottom, do remember to remove it manually. For getting rid of it permanently, you’ll need to opt in for a premium subscription.
Furthermore, hitting the Mailtrack icon on the extension tray or in Gmail will reveal a dashboard that you can access to monitor all the read as well as unread emails. On the left, you’ll find “preferences”, there you can enable/disable Chrome desktop notifications, email notifications, link tracking that tells you whether the recipients clicked the links in an email, and configure daily reports as well as define a Customer Relationship Management system (CRMS). That’s everything you need to know about Mailtrack. Do let us know in the comments section if you’re stuck somewhere or just share your experience with it.
