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double check in Gmail

Hi Jason,
I've bee using your Checker Plus for a long time and I'm very satisfied as well as really impressed by your work.
I have recently found an app called mailtrack: http://mailtrack.io/en which adds the double check in the sent mails when they are opened by the receiver.
The app works fine but it cannot handle several acounts at a time as your app can.
I wonder if there is any chance you could add this nice help in a future version.


  • I'll take note of this, however, I would rather let the Gmail team perhaps take care of this functionality, try suggesting it to them.
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