It's generally best to write in a block format, without indenting. 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. How to write a resignation letter that's effective immediately? They don't have to accept a resignation. You're handing it in. 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. This letter accepts an employee's resignation, noting their last day will be after serving out their required notice period according to their contract. If your employment contract does not specify your notice period, you should give at least a week's notice before leaving your role. Learn how to write a professional resignation acceptance letter with our helpful guide.