Email tracking is one of Streak's most popular power tools. Like all email tracking tools, it is fallible, but can still help you understand how recipients are receiving your messages.

When sending an email, you can see whether email tracking is on or off by the tracking icon at the bottom of each thread. From the toolbar at the bottom, clicking the icon will toggle tracking on and off.
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See our article here. Please note that Streak tries to block your own viewing activity to prevent counting your own actions as views.
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You can configure your notifications for tracked emails from the Streak Settings page in Gmail's preferences. From there, you can enable and disable email and browser notifications for individual views.

Learn more about Streak here.