How can i tell if an estimate ive emailed has been received/viewed?

Welcome to the QuickBooks Community, lonnshar-hotmail.

I appreciate you reaching out to the Community for support. At this time, there isn't an option that allows you to see if your customers have viewed the estimate that was emailed to them. I can see how being able see the status would be beneficial for you, so I recommend leafing feedback. Comments are viewed and considered as our developers create features and updates for the software. 

If you have any other questions, feel free to reach back out.