An acknowledgement letter is a formal business letter informing the addressee that the sender has received something from the addressee, e.g., goods, services, or donations.
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The purpose of the body of a letter is to convey the information that is the reason for the letter.
acknowledgement
It should succinctly state the purpose of the letter.
The first sentence (paragraph) of a business letter should state why you are writing (the purpose of) the letter.
It would impress customers and investors