Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. How to write a resignation letter that's effective immediately?Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. In this article, we cover everything you need to know about writing a resignation letter without notice and provide an example to get you started. I am writing to announce my resignation, effective in 24 hours.