People who subscribe to your website are people who are interested in what your company or your business has to offer. By collecting the email addresses of people who visit your website, you are actually coming up with your lead' list. Sending a copy of your newsletter to these email addresses monthly will help you build a relationship with these contacts.
Your newsletter must have useful tips that are related to the business or the industry that you are in or the product that you offer your clients. It is also a great tool that you can use to publicize new products and services. Aside from making your prospective customers a lot more familiar with your business, it will also increase the possibility of them remembering you first before any other company if and when they need the kind of product or service that your business or company can offer.