How to write a resignation letter that's effective immediately? Start with the facts and be direct.Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Professional resignation letter examples for different reasons. Free templates and writing guide to resign on a positive note without feeling awkward. POST forms have been developed for law enforcement agencies to consider as part of the peace officer and public safety dispatcher selection processes. When resigning without notice, your letter should state clearly that the resignation will be effective immediately.