We cover just that in this blog! You can learn how to write a customer appreciation letter and get many samples below.I just wanted to thank you for being a great customer and let you know that we value your business. Subject: Thank You for Referring New Customers! In this article, you will learn how to write a thank you for your order message that wins the hearts of your customers. "I am so grateful for your support of my small business. Thank you for being a valued customer.