Boost your renewal rates with a foolproof membership renewal letter! In this article, we explain what an official letter is and how to write one, plus we provide a template and example of an official letter for you to reference.Note: the text of the model letter is exceptionally brief. Most appeal and request letters require a page or two. Sample Supporting Documents. Signed Application Form. A cover letter shows an employer how your experience qualifies you for a particular position. Trying to write a membership renewal letter but don't know where to start? Recruiting letter sample: Dear Chris,. Our staff has identified you as one of the top junior recruits this year.