"Your generous donation has made it possible for us to provide essential services to those in need. We are deeply grateful for your support.Learn our top 15 tips for writing the perfect thank you letter, browse inspiring samples, and get your hands on readytouse templates you can customize. Donors are 4x more likely to give to your mission again when you thank them within 48 hours. My sincerest thank you. I don't know if my gratitude can help your healing, but I want you to know you and your loved one have made my life better. Fill out this form carefully to ensure accurate information about your donations. What do you need to include in your donation acknowledgment letter? To meet them, we ask that you've first established some contact through anonymous correspondence, and then everyone must complete an authorization form. Letter of request on official organizational letterhead describing the Mission and Goals of the organization.