Dear Dr. Smith, Thank you very much for agreeing to write a letter of recommendation for me. I've appreciated your help all the more since I learned how busy you would be at the end of the term. I am enclosing a stamped envelope addressed to the graduate school of the university so that you can just drop your letter in mail. I will let you know at once if I get the scholarship. Thanks again for all your kind support and understanding. Yours sincerely, Bill Miller