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EmailAnalytics - EmailAnalytics is an email analytics and statistics solution for Gmail and GSuite.
GetNotify - GetNotify is a free email tracking software solution.
CouponFollow Cently - Coupons at Checkout is a browser plugin for Chrome, Firefox, Internet Explorer, and Safari that...
Mailtrack.io - The best email tracking solution I've found. Free
Encarte - One-click checkout for over 500,000 online stores