No matter how much you may want to tell your boss to “take this job and shove it,” it’s far better to part in a professional manner. A good way to do this is with a formal resignation letter. Your letter should be short and to the point. Most important, it should state when you plan to leave your job (no need to include the why). Do your best to go out on a high note by thanking your boss for the opportunity. When you’ve completed your letter, deliver it formally in person rather than through e-mail. This isn’t a piece of communication that you want being forwarded to others around the office.
For more on resignation letters, be sure to read Ten Things to Leave Out of Your Resignation Letter.