Want to know how to write a retirement letter of resignation? Get the insights you need and free retirement letter template to help guide the way.This page provides information on how to resign from the university whether it's leaving for to accept another position or to retire. 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. How to Write a Retirement Letter Due to Retirement? To leave your role on a professional note, learn how to write a resignation letter. As a bonus, check out our samples. Retirement_Resignation_Separation Notice. For those in the biopharma industry, it's pretty common to move from one job to another throughout the course of your career.