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.The taking of an acknowledgment consists of positively identifying the signer of a document. Acknowledgment (in a representative capacity):. The purpose of letters of acknowledgment is to provide proof that you have received specific documents or a specific type of request. Customer Name (please print):. I mailed my OCI application to Chicago consulate on 19-Jan-2007 via priority mail and my application was acknowledged today 15-Mar-2007. The easy answer: Yes, you may notarize out-of-state documents. An acknowledgment letter is a receipt letter that informs the sender that the receiving party has received the information that the sender has given.