How to write a resignation letter that's effective immediately? We've rounded up tips and examples for writing a resignation letter that'll help you maintain work relationships long after leaving a company.Learn how to write an immediate resignation letter with our comprehensive guide, including tips, examples, and a customizable template. Please accept this letter as a notice of my resignation. What It Takes to Write A Great Resignation Letter. Create the perfect resignation letter in 30 seconds with our free AI resignation letter generator. Due to unforeseen personal reasons, I am unable to provide any notice.