13 Top Secrets of Donor Thank You Letters. Secret tip one: Consider adding a personalized handwritten note in the right-hand top margin.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. Last Name REQUIRED Please fill out this field. Please enter valid data. Donors need to be appreciated too. If you want some guidance, check out our donor thank you letter templates for any organization! If you prefer to simply support our ministry, we would greatly appreciate it. Thank you in advance for your contribution. Thank you for being part of this journey—we can't wait to see you in March!