There are instances where Cirrus Insight may not be able to find Gmail's unique identifier for messages that you've sent. To avoid issues with an inconsistent status message, we recommend that you enable Gmail's popular "Undo Send" feature.
1. Click the Gear icon at the top right of your Gmail browser window.
2. Click on Settings in the drop-down menu to access Gmail's settings (not Cirrus Insight's).
3. The General tab is displayed. Scroll down and locate the "Undo Send" section. Click to check the box next to "Enable Undo Send."
4. Scroll to the bottom and click on the "Save Changes" button.