Breaking up is hard to do, but pouring your heart out on paper is rather awkward. There is really no need for any other information in your resignation letter (including a reason __ which is completely optional). No effusive template and formatting effort is required. This is not a letter that is going to be hanging on anyone's wall, and it probably won't even be filed away!
However, if you know the right signs to look for, there's a good chance you can figure out what kind of reaction to expect__and that can make the conversation go much more smoothly. Here are a few common reactions and how to anticipate which one you'll receive.