Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. 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). Discover 30 creative ways to say "thank you for your support" in this article. Strengthen your relationships and spread gratitude with these unique ideas. We are writing to express our deep gratitude for your recent financial donation to (Name of Organization). Writing a Financial Support Letter for Family Member with. Letter of Support. Cochrane. A clear ask and a specific why.