How to write a resignation letter that's effective immediately? 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.You can leave the company without notice period after fighting with HR and your manager,but thats not a good thing. Due to unforeseen personal reasons, I am unable to provide any notice. We've rounded up tips and examples for writing a resignation letter that'll help you maintain work relationships long after leaving a company.