This article will address how to write a retirement letter of resignation and provide an example that you can use as a template for your own retirement letter. Address the right people.Add contact details, company name, and date. This stepbystep guide shows you how to write a retirement letter to your employer. It also includes FREE templates and examples to help you take action! Your retirement resignation letter should begin with a header that states the contact information of the sender and addressee as well as the date. A retirement letter is a type of resignation letter, but the main difference is its purpose. Decide on a Delivery Method.