Promote up-sells/cross-sells. You can even set up an autoresponder sequence for someone after they purchase and get repeat customers. Depending on the products you sell, you could offer an upsell, or cross-sell related products. For example, if someone buys a digital camera, you can offer to add a lens, a tripod, and other accessories to their order before it ships. Or, if you sell products that people buy frequently (like food or disposable items, like diapers), you can automatically send them offers for new items when you know they’re about due for another order.

There are two great things about Mad Mimi. First: it's very cheap. Second, it's very easy to use. These two factors may convince users to purchase a plan. However, some users will find that there are some noticeable omissions when it come to more advanced functionality, particularly in the autoresponder and split testing department. - Chris Singleton
Finally, you can optionally include “automations” with your broadcast. Automations are a simple way to automatically add or remove tags when your subscribers do certain actions, like open the email or click on specific links. Adding and removing tags are important when creating segments, or subscriber groups, and triggering automated email campaigns.