How to unsubscribe from "Parts Tracker Daily Summary" emails?

[Eugen]

Untrack the parts you're getting notices for (there's a button near the top of the parts page with a bell icon). Note that if you post an event to a part (e.g. submit, comment, etc) the system will automatically track the part again.

Just a suggestion: it would be good if there would be "Do not send email notifications from Part Tracker" setting.