Consider the following resignation letter examples: Click on the image to download our two weeks resignation letter example. How to write a resignation letter that's effective immediately?Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Dear Sirs: Effective immediately, I am not a member of UFCW Local 99. I resign my post of Chair of Criminology in the Department of Social Policy and Criminology with immediate effect. I resign my post of Chair of Criminology in the Department of Social Policy and Criminology with immediate effect. It is my regret to inform you that I must hand in my resignation as head of security at Cornado Center. Please accept this letter as official notification of my resignation from my position as Floor Manager, effective immediately. (For example, "I regret to inform you that I will be resigning from my position, effective immediately. This does not need to be complicated a short resignation letter is the way to go.