How to write a resignation letter that's effective immediately? Formal Resignation Letter Sample.Use one of our resignation letter templates. Your resignation letter should be brief and to the point. You don't need to include lengthy explanations about why you are resigning. Change address in the Resignation Confirmation Letter effortlessly. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. Resignation Week Notice sale Letter. Resignation Week Notice Letter Template ProBizTemplates. Welcome to USA Powerlifting The Athlete's Choice For Drug-Free Strength Sport Online Training App USA Powerlifting's Official Online Training App.