See the options you have for your signup form when segmenting your List for Groups in MailChimp. Groups are a powerful feature and allow your subscribers to select what type of info they receive from you according to their interests. In other words, it allows you to instantly notify a target segment of your audience when you’ve made a new post on something they want to know about. That could be any of your blog Categories or all of your posts. And, you have choices when it comes to how folks select what they want.