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 effective fundraising letters that inspire more support from donors.Explore best practices and templates in this comprehensive guide. I am writing this letter to personally thank you for the donation you recently made to the United Efforts organization. Guidelines for writing appreciation letters: State what you appreciate and briefly explain why. Learn how to write an employee appreciation letter with these templates and examples. Download the template for free (PDF or Word). I am writing to express my deepest gratitude for your generous financial support. Your financial aid has relieved a significant burden off my shoulders. Use one of these letters as a guideline or template to create your own mission trip fundraising letter.