One of your instructors has complied with your urgent request for a letter of recommendation and has given you an enthusiastic endorsement. Regardless of the outcome of your application, you owe thanks to all your supporters. Respond promptly after receiving this favor. Also, you can assume that your instructor is interested in your progress. Let him or her know whether your application was successful.

Your Task. 

Write an e-mail or, better yet, a letter thanking your instructor. Remember to make your thanks specific so that your words are meaningful. Once you know the outcome of your application, use the opportunity to build more goodwill by writing to your recommender again.