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SONAR will show if your email has been opened or not so you can make better decisions on what to do next with your email. Get instant web-push notifications when someone opens your email to make your next move.
SONAR - An Email Tracker for GmailSee when your emails are read, every time
Imanuel Abrahamleft a comment
SONAR by MTARGET is a Chrome extension for Gmail that will give you peace of mind and a hint of what is the next email you should send or the next action you should take after you send an email. You will know whether your emails have been opened and how many times they have been opened.
SONAR - An Email Tracker for GmailSee when your emails are read, every time