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! REMINDER: Please complete the second step, Scholarship Recipient Profile and Thank You Submission Form. Sending out customer appreciation letters is an excellent way to connect with your clients. Learn how to write a customer appreciation letter here. I would like to express my sincere and heartfelt thanks for the wonderful and professional treatment received therein. Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. 42 customer thank you card ideas to show your appreciation.