An acknowledgment is one of the most common types of notarial acts, but it often confuses Notaries. Here are 5 steps to performing an acknowledgment.How do you fill out an acknowledgment letter? What do you need to include in your donation acknowledgment letter? Your acknowledgment receipt should contain the names of the issuing party and the person receiving the document. You will receive prompt acknowledgement of your application confirming that a message will be sent and returning all documents to you.