In this article, we discuss what to include in a professional resignation letter and we share examples of resignation letters you can use for reference. PURPOSE: To retract the employees WSU identity and ensure the employee Resignation process is thorough and complete.Learn how to write a professional resignation letter with our step-by-step guide and easy to use templates. I regretfully have to inform you that, after much thought, I have decided to resign and please accept this letter as a formal notice of my resignation. My last day of work for you will be on X date.