I have been on an odyssey to find the best emailing solution. I've tried iContact, Aweber, and MailChimp. Along the way, I've done research on other solutions to see how they compare. Eventually, I got started on ConvertKit and wish I did so earlier. ConvertKit allows you to easily segment your lists and create advanced automations. You can move subscribers to different parts of your autoresponder based on any action they take (i.e. a click, a purchase, an open, etc.). I can't see myself using an emailing solution other than ConvertKit.