Why is email marketing an effective tool? When running an email marketing campaign, it allows you to keep in touch with your clients and subscribers on your email list. You can market your list in varies ways. You can run campaigns to attract new potential clients and contact them regarding new products or services you are able to offer. Discuss changes in the industry or growth of your business. Email marketing is an intelligent way to motivate clients to act on your messages that you send to them. You can entice current customers to purchase future services just by telling them what you are offering or how your offerings can help them in their business grow.