And sure, this could be an email (all of the same principles would apply), but a letter makes things official in every sense. It also gives you a prop to take along to the face_to_face meeting with your boss, when you let him or her know that you're leaving.
What Should My Letter of Resignation Say?. If you're not sure of how to write a resignation letter, that's normal __ it's certainly not an everyday task. Take a look at a sample resignation letter, or a few if you want to explore different options. In our view, the shorter the resignation letter, the better.