What do you need to include in your donation acknowledgment letter? A donor acknowledgement letter should include a few specific items to assist the donor and help your organization comply with IRS regulations.A donation acknowledgment letter (sometimes called a donation receipt or thankyou letter) is an email or paper that recognizes a charitable contribution. Please retain this letter as our acknowledgement of your donation. Acknowledgment of "no goods or services were provided as part of this donation. When acknowledging these donations, include the name of the donor, the number of shares, the name of the security, and the date when the transfer was completed.