Thank you letters do not need to be long. Write an excellent thank you letter for donations.Get tips and best practices, plus three inspiring samples and ready to use templates! Gathered below are examples of the best donor thank you letters that exemplify both authentic gratitude and effective nonprofit fundraising at work. 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. A short note from you affirms the value and significance of their contributions and encourages their continued support. A short note from you affirms the value and significance of their contributions and encourages their continued support. For example, "We are incredibly grateful for your generous donation to our cause. Thank you again for choosing to make a difference in the lives of others.