People will be more inclined to add their email address to your newsletter list if you make it quick and easy for them to sign up. A simple one field form on your site’s home page can help grow your newsletter list, increasing your readership.
If your site design doesn’t allow for adding the form easily, get creative! My site has a slider at the top, but you can just as easily make it a popup. Take advantage of every opportunity to increase your email list.