Prompt and thoughtful gift acknowledgments are central to effective fundraising. Thank you again for your thoughtful gift to Seattle Children's and the X Guild.Most sincerely,. Name. Use one of our donor letter templates. Customize them to fit your brand, then send them to prospective donors for your next fundraising event. Complete the acceptance form and attach the thank you letter from your offer letter. Examples. "Your generous donation has made it possible for us to provide essential services to those in need. We are deeply grateful for your support. Their first name: Always include the donor's name in the letter greeting. Thank-you letters should always be written in a personal, down-to-earth voice.