Mail a letter on my behalf (to). Step 1: Read all steps, instructions, and information provided below.Let's walk through common examples of donation letters, starting with a template of the basic format to follow. How do I fill this out? Be sure to customize and personalize your message to make it your own! Sample Donation Request Email. In this post, I'm breaking down how to write a donation letter. Along with the completed application, provide copies of: • Identification for all household members. (i.e.