Cold outreach doesn't have to be difficult or expensive -- that is -- thanks to Sendia, an outreach tool for Gmail that's free and easy to use. Send a bulk email campaign in seconds.
ifRread - ifRead is a free email tracking service that tracks email you sent.
Unlimited Email Tracker - Track opens and clicks, set reminders and delays in Gmail
GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Mailtrack.io - The best email tracking solution I've found. Free
Mailshake - Mailshake lets you build your professional network through a smart and intuitive approach to cold emailing.
EmailTrackerPro - EmailTrackerPro is an email tracking and spam filter solution.