Include your course of study and anticipated year of graduation. Be sure to communicate your appreciation to the donor for their generosity."Dear Mr. Rue, thank you for your encouragement during the most difficult times. Your advice and care helped ease my worries and helped me make better choices. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). Below is an example of a letter to the commander recommending members for a Letter of Appreciation. Do your thank-you letters for donations truly convey gratitude? The message of appreciation should stand alone. Be brief, warm, and sincere.