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. Learn when and how to write a thank you letter to your customers and review a template and two examples to help you craft your own letter. Subject: Thank You for Referring New Customers! Take this time to write a letter to your future self. 1. Select and copy the text below. 2. Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. 42 customer thank you card ideas to show your appreciation. It can be as simple as a small, handwritten thank you note of thanks.