You want to give at least a two weeks' notice. 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.In the US I would say it's not safe, at least not entirely. That's communication with your prior employer usually from the email address they provided. Explore more articles. This letter accepts an employee's resignation, noting their last day will be after serving out their required notice period according to their contract. Kindly assist in training your replacement to ensure a smooth transition. You must give at least a week's notice if you've been in your job for more than a month. Your contract will tell you whether you need to give notice in writing. Template for an employer to acknowledge an employee's resignation.