This is a process described by Seth Godin known as permission marketing. The core concept of this idea is that you never market to someone that doesn’t want it, you first have to ask them for their permission. When someone signs up to your email not only do they become a warm lead but they give you their permission to send them offers and to market to them.
E-marketing is a process of planning and executing the conception, distribution, promotion, and pricing of products and services in a computerized, networked environment, such as the Internet and the World Wide Web, to facilitate exchanges and satisfy customer demands. It has two distinct advantages over traditional marketing. E-marketing provides customers with more convenience and more competitive prices, and it enables businesses to reduce operational costs.
Update your website and continuously offer useful and updated content. Think of your website as a storefront but in the virtual world. In the same way that you do not leave your physical store unattended for a month, you would not do the same to your website. Always update your website and keep it fresh by having a blog, announcing sales, special offers, and new products. Think that you are a customer yourself, so give them the information that they want.