I keep hearing that email newsletters are one of the best ways to market a book, but I’m not sure how to use them effectively. Do they really help sell books, or are they just a way to stay connected with readers?

I’ve seen some book marketing services in USA that offer email marketing as part of their strategy. Do they help with building an email list, crafting engaging content, or running promotional campaigns? Also, what kind of content should an author include—just book updates, or should I mix in personal stories, behind-the-scenes insights, and free content?

For those of you who’ve used email newsletters to promote a book, what worked best for you? Did you see a noticeable increase in sales or engagement? And how often should an author send emails without overwhelming subscribers?