While writing an application letter, you can address the HR personnel of the company requesting to issue the experience letter. Professional resignation letter examples for different reasons.Free templates and writing guide to resign on a positive note without feeling awkward. Learn how to write a resignation letter (and what not to include) and then use our example letters as a guide. It follows the verbal notice you give your supervisor about quitting your job. Why should I write a resignation letter? 18'h,2021 at p.m. EST.