BigMailer Lists can be used in a variety of ways, depending on your business needs. You can have unlimited lists at no extra cost in BigMailer, pricing is based on the number of unique contacts.
Lists Based on Email Collection Sources
If you are collecting emails from a variety of sources, for example sign up forms on your website’s homepage/articles, member registrations, opt-in on a partner page, or signups during offline events, it might be helpful to define your Lists to mimic your collection sources. You could go very granular (separate blog signups from say homepage) or you could rollup some sources into major groups (on-site, off-site).
This will help you see and understand your engagement stats for each of your lists and get to insights on which source maybe producing low-quality or high-quality email lists.
Lists as Main Customer Segments
While you can segment your campaigns on any of your data points, it maybe beneficial to define lists based on most commonly used criteria like Members vs. Paid Customers, or segment your customers based on product/service they purchased so you can see engagement stats across those major segments on the main Lists view. Using your main segmenting criteria to define your lists can also help you streamline your campaign setup workflow and lower risk of mistakes (sending an email to a larger than intended audience).
Lists as Both, Sources and Segments
You could actually combine the two techniques described above, it just slightly complicates the initial setup for email collection. Just make sure to name your lists in a way that prevents confusion as to what they are and represent.