Dear …
We are in receipt of your letter of recommendation dated __(date)__. Thank you for recommending __(Name)__ for the position of __(type of position)__. __(His/Her)__ qualifications are of definite interest to us.
Soon we will be contacting the qualified applicants to begin the interviewing process. As we make our candidate selections, __(Name)__ will be given every consideration possible. Thank you again for taking the time to send a letter of recommendation for __(him/her)__.
Yours truly,