The following are the things to keep in mind when writing an immediate resignation letter: Write the date first. Explain only necessities.Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. 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. Here is a short notice resignation template you may use to assist you with writing a resignation letter. Due to unforeseen personal reasons, I am unable to provide any notice. I regret to inform you that I will be leaving XXX on June 13th, 2022. Here is what a heartfelt resignation letter should include with a sample, as well as an example letter noting regret at leaving.