The message of appreciation should stand alone. Be brief, warm, and sincere.I want to convey my heartfelt gratitude to all the members of the foundation who work tirelessly to make the world a better place for individuals like me. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). In this guide, we'll provide tips on how to write a thoughtful and effective thank you letter, along with some sample letters for inspiration. Check out these sample employee recognition letters for years of service. Or, get ideas to spark your creativity for a speech. I just wanted to express my heartfelt appreciation for the recognition and thoughtful gift. I wanted to express my appreciation for your continued mentorship over the last five years.