Mailtrack

Free Email Tracking for Gmail to know when they are Opened

Screenshots

Hunter's comment

Read receipts are quite common in the messaging tools these days, but something which is not present there on Emails.

But, with Mailtrack, one can now have similar read receipts in their Gmail to track what emails were read through by the receiver.

Available for free, with an option to upgrade to a paid version, this is a really helpful tool for marketing people to reach out to their prospects and track emails.

Link

https://mailtrack.io/en/