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.I'm sorry to leave without notice. Due to unforeseen personal reasons, I am unable to provide any notice. Master the art of writing a resignation letter with our comprehensive guide, offering step-by-step instructions, tips, and templates. This resignation letter sample provides your employer with a letter for your file and also suggests that you've done everything you can to remain professional. Dear (HR Manager's Name),. In this article, we explore what a sameday resignation letter is, why it's important to write one, how to write one and provide a template and an example. State your notice period, which should be in line with the terms of your contract. If necessary, review your contract to confirm how much notice is required.