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.Thank you for taking the time to meet with me at the Central Florida Career Fair today. I am writing this letter to personally thank you for the donation you recently made to the United Efforts organization. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). Writing a Financial Support Letter for Family Member with. Letter of Support. Cochrane. Discover 30 creative ways to say "thank you for your support" in this article. Strengthen your relationships and spread gratitude with these unique ideas.