What do you need to include in your donation acknowledgment letter? Contact us, begin a fundraiser, or donate online.Complete and mail the Stock Donation Letter of Intention. To begin the process of donating stock, please complete the Stock Donation Letter of. Intention. Learn how to write effective fundraising letters that inspire more support from donors. Explore best practices and templates in this comprehensive guide. A donation acknowledgment letter (sometimes called a donation receipt or thankyou letter) is an email or paper that recognizes a charitable contribution. To acknowledge your contribution appropriately, please complete the enclosed donation form and return to us. For each offline donation made, please complete a line in the chart below. Upon receipt of your donation you will be mailed an acknowledgement letter for your tax purposes.