Ensure the most current form has been submitted. 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.An employee wishing to leave in good standing shall file a written resignation with the appointing authority in the form of a Resignation Notice or a letter. Your retirement resignation letter should begin with a header that states the contact information of the sender and addressee as well as the date. Use this resignation letter sample as a model to advise your employer that you are resigning because you are leaving the workforce. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. SAN BERNARDINO – In a resignation letter that effectively served as his last words as finance director, Jason Simpson gave San Bernardino a stark warning.