At the end you should sign off with "sincerely yours" or any other related salutation. If you are writing a letter of intent for graduate school then it would have a different content. First of all letter of intent would start with your name, address, contact number and email address. After you have mentioned the date, you should then add a salutation like "Dear Sir/Mam".
Why? Because my intent can change. I intend to buy the Empire state building, but who cares what my Intent is? Many traders and Brokers treat a Letter of Intent as if it were holy writ. This is a critical beginner's mistake. As its name indicates _ this document expresses an intent.