Email tracking is one of Streak's most popular power tools. Like all email tracking tools, it is fallible and cannot be relied on as an absolute source of truth. It can still help you understand how your recipients are receiving your messages, though.
Turning email tracking on
If email tracking isn't on by default already, you'll need to enable tracking on an individual thread basis.
- Open a new message (the reply or compose windows)
- From the toolbar at the bottom, select the tracking icon. Clicking the icon will toggle tracking on and off.
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.