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".
Another contract law attorney, Ivan Hoffman of California, makes essentially the same point: "Parties to a transaction sometimes intentionally create a letter of intent as an expression of what they intend to agree upon should certain circumstances arise... [whatever happens], the document will not be binding and thus not enforceable until those circumstances arise. Thus, the letter of intent is essentially a legally worthless document. It is not clear to me the reason any party would ever bother to create such a document and yet I have seen it used on many occasions. If parties to a transaction intend to bind each other, then they should create a binding contract, not a letter of intent. If the parties to a transaction do not intend to bind each other, then why bother creating a document that is not binding?