A common marketing tool is email newsletters. They are convenient ways of sending information to multiple targets. A good newsletter system is difficult to implement, and the recommended way is to use ones available in the market. A well known one is MailChimp (https://mailchimp.com/).

MailChimp has a lot of possibilities, but the interesting one in regard to this book is its API, which can be scripted to automate tools. This RESTful API can be accessed through Python. In this recipe, we will see how to add more subscribers to an existing list.