What do you need to include in your donation acknowledgment letter? The certificate of acknowledgment (PDF) must be in the form set forth in California Civil Code section 1189.Have standard donor acknowledgment letters at the ready, and make it easy to fill in the donor and contribution information. DonorPerfect helps you stay on top of receipting all year long, avoiding clerical errors and making tax time hassle-free. WITNESS my hand and official seal. Signature. (Seal). A notary public or other officer completing this certificate verifies only the identity of the individual. Angeles, among other noteworthy accomplishments. If you wish to receive a letter of acknowledgment for your donation, please take a moment to complete the form below. Please follow IRS guidelines in completing the description of goods donated and the value of the goods donated.