I am writing to confirm my acceptance of your employment offer on April 20 and to tell you how delighted I am to be joining XYZ Corporation in Chicago. Once your application has been processed, you will receive an appointment letter or an interview questionnaire in the mail that requires a response from you.An appointment letter is a formal document that a hiring manager uses to present a candidate with a job offer and outline the aspects of the role. Download and complete the Motion to Appoint Special Process Server, available from the Office of the Illinois Courts.