“Consider using a lightbox-style pop up form on your website. Lightbox forms don’t affect bounce rates, but they will exponentially increase your email sign ups.”
According to Christopher Lester, the average email list churns about 30% annually. This means that you should never be satisfied with your list, and growing your subscriber base is something you should be doing all the time. While pop up windows can seem obtrusive, they’ve proven largely successful at feeding your list regularly with new subscribers.