Subscription Method: How did your email recipients subscribe to your emails? Did they find your Web site from a search engine and decide to opt-in? Are they a customer that automatically gets put on your email list? Are you an ecommerce site that provides an "opt out" or "opt in" checkbox during the purchasing/check out process? It goes without saying, in general, that people who have sought out information and then opted in to receive emails from a company are highly likely to open those emails. On the other hand, if you include a pre-checked sign-up box at the end of a lengthy purchase or registration form, people may either forget to uncheck the box or just miss it in their haste to complete the form. Regardless, how people got on your list is a major driver of their likelihood to open future emails.