Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word).The following sample thank-you notes illustrate the kinds of things donors would love to hear about you and the impact their generosity has had on your life. Once again, thank you for your unwavering support and encouragement. Your belief in me has made a profound difference in my life, and I am forever grateful. Below you will find sample appreciation letters to send or email an individual or individuals who have helped you at work. The message of appreciation should stand alone. Be brief, warm, and sincere.