Building a mailing list is one of the most important things a self-published author can do to turn her successes into a real career. Discovery is the biggest challenge for any writer, but once you’ve been discovered, it’s critical to keep that new fan engaged.
Mailing lists are the industry’s most commonly recommended method for securing that relationship. At every opportunity, ask your fans to sign up for your list so you can contact them directly when you have important news for them. It’s the cheapest method with the lowest barrier to entry for keeping a reader you’ve already engaged.