The GoEmailTracker tool is really good, at keeping track of when emails are opened and clicked on. It gives you information on how engaged people are, with your emails. It's easy to use for all levels of experience. Whether you're just starting out or you've been doing this for a while. I like that I get notifications away so I can see how well my email campaigns are doing in time. It's a budget option if you want to improve your email marketing game.