GoDaddy Email Marketing provides great statistics to show you how many people are opening, engaging with and sharing your email. There’s no mystery or guesswork. You can even compare different emails side-by-side to quickly see which emails get the best response. Once you know what appeals to your readers, you can refine your emails for even better results.
Watch the growth of your list. Is your email list growing or shrinking? If more people are unsubscribing than are registering to your list, it's a good sign that you need an entire strategic overhaul on your email policies. If there are a lot of people unsubscribing it could be because your content is not relevant to the people that you're sending it to. In this case, try to segment your list differently or change the type of content that's being delivered through your email blasts.