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.