A sales letter is an important tool for shaping the way customers think of you. Have you ever tried (or been tasked with) writing a sales letter?Sales letters require certain elements that help convince a customer to invest in a product or service. Discover examples of business introduction letters, including those for new products, services, companies, and employees. The letter is a response to a job advertisement seeking a supervisor position. In this article, we show you how to format a business letter and what to include and provide examples and a template to help you write your own. Discover a sample letter template for starting a new business. When I write sales letters, I try to be as clear, logical and persuasive as possible, and that starts with gathering the facts. A sales letter is a direct marketing tool used to persuade potential customers to purchase a product or service without a salesperson present. Who must obtain a seller's permit?