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.If someone gives a resignation letter without giving the required one month's notice, what can his employer do against him (like filing a complaint)? Inspected at any time without prior notice. If you're wondering how to write a resignation email without a notice period, then our sample can help. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation.