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".
Kalogredis calls that basic fact that a document generally viewed by many as a casual and non_binding document, could atimes still become binding under certain unpredictable circumstances, "one of the traps in a letter of intent," and adds: