ReadMeKnow

ReadMeKnow is a free and easy-to-use tool that lets you know whether an email you sent is read by the recipients. It is completely anonymous and invisible to the recipient. No signups or logins needed. You can send a new email with tracking or attach tracker to an existing email thread. You will be notified when the recipient reads the email and also know how many times the email is read.

Anonymous: Your tracked email will not ask the recipient for a read receipt. The embedded read tracker is also completely invisible. Your recipients will not know or see the email contains a tracker.

Easy and Secure: No signups, no email logins, no need for your personal information. Download the app and send a tracked email within seconds.

Two Modes of Tracking: You can either start a new email thread with tracking. Or, you can attach a tracker to an existing email thread.

Disclaimer: You will not be notified for recipients who disable "display all images" in the email setting.