Take a closer look. Subscriber Interests Add checkboxes, radio buttons, or a drop‑down menu to your signup form, so subscribers can join groups when they sign up for your list. Segmentation Segment your list by interest. Send email campaigns based on your subscribers' preferences, so they only receive newsletters that are relevant to them. Send Frequency Find out how often people want to receive emails from you, and send newsletters accordingly. Hidden Groups You can even hide groups from forms if you want to use them internally only. For example, you might want to divide subscribers by support level without displaying it publicly.