When we think about email marketing metrics, the first things that come to mind are definitely opened and clicked rates. When thinking a little further, we also take unsubscribe rates, delivery rates, bounce rates, date and time reports into account. And let's be frank about it: these metrics are the backbone of any solid reporting… but they don't completely reveal how your email marketing strategy affects your business.
Basic reporting is still a solid backbone to any email marketing strategy. But keep the 5 metrics above in mind to really start optimizing your email marketing campaigns.