Email marketing is the act of promoting a product, selling a service, telling a story, or connecting with an audience through email. A marketing email is a one-to-many communication from an organization to a mailing list of customers and prospects. Email marketing can be a very cost effective way to reach, engage, and retain your customers. Of course, that requires that you send the right email to the right people at the right time. Working with email marketing services can help you send email campaigns that are effective and ensure successful email delivery.